How to calculate total weight for different BOM.
Check the attached file for reference.
I think S-061594 in SolidWorks KB has some Solution which is related to your Problem . I think it will help you. Or else you can also try this Workaround.
Add a Custom Property As Total weight and Enter the value of the Total Mass in it.Now by Using link to property , Add the total weight in the BOM and hence if there is any change in Future both Bom As well Custom property gets updated.
Hope it was Helpful.
Thanks & Regards,
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