I have the code listed below. After this code has been executed, I need the ability to add a value to the variable
(i.e. corplygroc = corplygroc + closed.lygroc)
When I did this, the corplygroc valued was not increased. What is a better approach to this?

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sum detail.lygroc to corplygroc
sum detail.lymeat to corplymeat
sum detail.lyprod to corplyprod
sum detail.lyphar to corplyphar
sum detail.lypetr to corplypetr
sum detail.lybake to corplybake
sum detail.lydeli to corplydeli
sum detail.lynonf to corplynonf
sum detail.lyhbc to corplyhbc
sum detail.lyvide to corplyvide
sum detail.lyflor to corplyflor
sum detail.lyfroz to corplyfroz
sum detail.lydair to corplydair
sum detail.lybarn to corplybarn