This app will allow you to do Assembly Costing.
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The concepts starts with a basic parts list. You can then construct anÂ "Assembly" ie a Bill of Materials (BOM) and typically add labor to get an "Assembly". Each Assembly has a Parts cost andÂ a Labor cost and then of course a Total cost.
But the magic with this app is then you can take that Assembly and use it in another BOM which would typically have more parts, Â and more labor and more other Assemblies to get another higher level Assembly. But the delightful aspect of this app is that the Assembly table can infinitely be a child of itself, so there is not theoretical limit to how "deep" you can go in terms of nested Assemblies. The app was originally written for a client who has Assemblies which go 5 level deep, but there is nothingÂ in the design of the relationships which limits it to that 5 levels.
Each Assembly shows what its child BOM is, Â and also which are it's parents, ie where it itself is used in a higher level Assembly's BOM.
Realistically, for most users you will probably need an hour of my time to get this working. But if you do need to have a way to calculate your costs when you have a hierarchy of nested Assemblies, it will be worth it for you. It took me a whole lot longer than an hour to write the app.