How can I link the BOM total in a assembly to reflect that to the qty on a part drawing?
If you are creating a part drawing on an additional sheet of the same assembly drawing, you can link the qty.
Right click on the part drawing>properties, you can see "Link ballon text to specified table" and enable that
See another discussion here
No, I what to link to a seperate drawing, I have many part and part drawings
there is no out of the box, automatic way to do that. and even the work arounds I have seen are not linked.
what would you put on the drawing if the part was used in more than 1 assembly?
You can copy the assembly BOM to the new drawing as new sheet then link the same way as explained before.
I doubt about another way of doing it, unless someone think of a macro, if possible
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