How to write relations in a table in a format ?

Question

Hi PTC community !
 
I need to create a format *.frm with a Bill of Materials that groups the parts by categories. One category is Mechanics. The other is Electronics. The table is the following :

The &tot_mech parameter is the summation of the &rpt.qty of the Mechanics repeat region. The &tot_elec parameter is the summation of the &rpt.qty of the Electronics repeat region. The &tot_parts is the total number of parts in the assembly.
 
My question is : how can I add a relation in the format that the parameter &tot_parts is the sum of &tot_elec and &tot_mech, that is : 
&tot_parts = tot_elec + &tot_mech ?
 
Thanks in advance
 
SylThis thread is inactive and closed by the PTC Community Management Team. If you would like to provide a reply and re-open this thread, please notify the moderator and reference the thread. You may also use "Start a topic" button to ask a new question. Please be sure to include what version of the PTC product you are using so another community member knowledgeable about your version may be able to assist.

ClintWalton · Answer

Hi Syl,Are those two separate Repeat Regions, Mechanics and Electronics? Do both repeat regions reference the same model? The way you create &tot_mech and &tot_elec values, will also probably need to be created in the repeat region that you create &tot_parts.Perhaps you can upload a small sample data set so users can take a look at your setup.

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