Engineering ERP · BOM and design control

One BOM, the right revision, every time

Wrong revisions on the shop floor, parts bought twice and changes nobody signed off cost engineering firms more than they think. TECHTARN BOM and design control keeps multi-level BOMs, revisions and engineering changes in one place, linked to your CAD, purchasing and production.

  • ∞BOM levels
  • 5step change control
  • ~6weeks to go live
  • Top coverSM-104 · Sheet metal
  • Control PCBEL-220 · Bought-out
  • Motor 1.5 kWBO-077 · Bought-out
  • Gear housingMC-310 · Machined
  • Base frameFB-001 · Fabricated
Exploded view · MX-200 · Rev C
Multi-level BOM

Build 1 or 500: the BOM does the maths

Every level, quantity and unit is kept. Change the build quantity and see what the shop and stores need, with shared parts like bolts added up across assemblies.

25
  • PartNumberPer unitTypeTotal
  • Mixer unit MX-200FG-2001 eaAssembly
  • Base frame assemblyFB-0011 eaAssembly
  • Frame weldmentFB-0111 eaMake
  • Leveling foot M16HW-0164 eaBuy
  • Drive assemblyDR-1001 eaAssembly
  • Motor 1.5 kWBO-0771 eaBuy
  • Gear housingMC-3101 eaMake
  • Bolt M10 x 30HW-1038 eaBuy
  • Electrical kitEK-0501 kitKit
  • Control PCBEL-2201 eaBuy
  • Cable 2.5 sq mmEL-0256 mBuy
  • Top coverSM-1041 eaMake
  • Bolt M10 x 30HW-1036 eaBuy
EBOM to MBOM

Designed one way, built another

Engineers group parts by function. The shop builds by work centre and adds paint, packing and kits. The ERP keeps both structures and links every item between them.

Engineering BOM

From CAD
  • Mixer unit
  • Frame weldment
  • Drive assembly
  • Motor
  • Gear housing
  • Control PCB
  • Top cover

Manufacturing BOM

For the shop
  • Mixer unitFinal assembly
  • Frame weldmentWelding cell
  • Paint kitPaint shop
  • Drive sub-assemblyAssembly line 1
  • Motor + gear housingAssembly line 1
  • Wiring kit (PCB, cable)Electrical bay
  • Packing kitDispatch
Revisions and approval

No change reaches the shop without sign-off

Each revision moves through five states. Only released revisions can be bought or built, and every step records who did what and when.

  1. DraftEngineer edits the BOM
  2. In reviewChecked by design lead
  3. ApprovedSigned off by quality and production
  4. ReleasedLive for purchasing and the shop
  5. ObsoleteKept for history, blocked for new orders
Compare revisionsMX-200 · Rev B → Rev C
  • +Leveling foot M16—→4
  • ~Bolt M10 x 306→8
  • ~Motor 1.5 kW1.1 kW→1.5 kW
  • −Rubber pad4→—
  • =Frame weldment1→1

+ added~ changed− removed

Where-used

Change a bolt, see everything it touches

Before you replace or change a part, the ERP lists every assembly, open order and stock location that uses it, so nothing is built from an old design.

HW-103Bolt M10 x 30
  • Drive assemblyBOM
  • Top coverBOM
  • Pump unit PU-50BOM
  • WO-3381 · openWork order
  • PO-2290 · 400 pcsPurchase order
  • Store A · 1 240 pcsStock
CAD to ERP

Release in CAD, ready in the ERP

When an engineer releases a design in SolidWorks, Inventor or AutoCAD, the BOM, part properties and drawings flow into the ERP. No retyping, no version mix-ups.

📐CADSolidWorks · Inventor · AutoCAD
🗄️PDM / VaultReleased files
🧩TECHTARN ERPItems, BOM, drawings
🏭Shop and storesRight revision only
Cost roll-up

Know the true cost of every product

Material, bought-out parts, labour and overhead roll up from the lowest level to the finished product. Change the build quantity to see how setup cost spreads.

Cost per unit · MX-200—
  • Raw material38%
  • Bought-out parts31%
  • Labour17%
  • Machine and overhead14%
Cost my own products
Clean item master

Each part should exist once

Most firms we audit find the same part saved under several names. Naming rules, classes and duplicate checks stop it happening again.

0Part numbers before clean-up
0After merging duplicates
0Fewer parts to buy, stock and count

Example from a typical audit, not a specific client.

Who it is for

Manufacturers whose products have structure

If your products are built from parts and sub-assemblies, this is for you. See the ERP pages for each industry.

Connects to your tools

CAD in, accounts out

We connect your design tools and accounts through our API integration work, so data is entered once.

  • SolidWorksBOM and properties
  • Autodesk InventorAssembly structure
  • AutoCADDrawing title blocks
  • SolidWorks PDM and VaultReleased files
  • Excel BOMsBulk import
  • Tally and SAPItem and cost sync
  • Barcode labelsPart and kit labels
  • Mobile appDrawings on the shop floor
Implementation

Live in about 6 weeks

We clean the item master first, because a tidy BOM is worth more than any feature.

  1. Week 1AuditCount parts, find duplicates and map how BOMs flow today
  2. Week 2–3Clean and set upNaming rules, classes, revision scheme and approvals
  3. Week 4ImportItem master and BOMs from CAD or Excel
  4. Week 5PilotRelease one product through the full change process
  5. Week 6Go liveAll products, training and handover
FAQ

BOM and design control questions

Answers for design heads, production managers and owners.

What is BOM management in ERP?

It is how the ERP stores what goes into each product: parts, sub-assemblies, quantities and units, in as many levels as needed. Purchasing, stores, production and costing all read from the same BOM, so everyone builds and buys the same thing.

What is the difference between an EBOM and an MBOM?

The engineering BOM (EBOM) shows how the product is designed. The manufacturing BOM (MBOM) shows how it is built: which parts go to which work centre, plus items like paint, packing and kits. The ERP keeps both and links them.

How does revision control work?

Every part and BOM has a revision letter and an effective date. A new revision goes through draft, review and approval before release, and older revisions stay in history but cannot be used for new orders.

What is an engineering change order (ECO)?

An ECO is a controlled request to change a part or BOM. It records why, what changes, who approved it and when it takes effect, and shows the impact on stock, open orders and cost before release.

Can it import BOMs from SolidWorks or AutoCAD?

Yes. We import BOMs and part properties from SolidWorks, Inventor and AutoCAD, or connect to SolidWorks PDM or Autodesk Vault so released designs flow into the ERP without retyping.

What is where-used analysis?

It lists every assembly, product, open order and stock location that uses a part. Before changing or replacing a part, you see exactly what it will affect.

Does the BOM roll up cost?

Yes. Material, bought-out, labour and overhead costs roll up from the lowest level to the finished product, using standard, latest or average prices.

Can we have alternate parts and phantom assemblies?

Yes. You can set approved alternates for a part, and use phantom or kit items that group parts for planning without being stocked.

How long does it take to set up?

About 6 weeks for most firms: part audit and clean-up, setup, import from CAD or Excel, a pilot release and go-live. A large or messy item master takes longer.

Get In Touch

Ready to build from the right revision?

Tell us what CAD you use, how BOMs reach the shop today and where mistakes creep in. We reply within 4 business hours and can demo with one of your own BOMs.

⏰
Response TimeWithin 4 business hours (your timezone)
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