Prevent BOM Item Number from Changing

Hi All,

I have a BOM which I use for my weldment drawings. Everytime I add a new body (example a new plate or beam) new item numbers get added, obviously. The issue is the whole item numbers get re-arranged and changed. Is there a way we can prevent this from happening, so that the old items retain their numbers irrespective of any new addition of bodies.

Regards,

LS

SolidworksBill Of Materials