We are using SW 2013 SP.4. Our various bill of materials and cut-list that we put in drawings include two quantity columns. One is the quantity for one item and the other is the total quantity to build the whole project (drawings are project driven, not product driven).
I've been able to add an equation for the whole "Total quantity" column of a bill of material which is a simple multiplication. Then, draftmen simply change the multiplication factor once and every items total quantity are updated. However, I have not been able to apply an equation to a column in a weldment cut-list to achieve the same result.