Is it possible to add enable control to a case structure.

i have to find add/subtract the data only if need it.Not all the time when the vi runs. I have added the difft operations-add,sub.div and mul in a case struct and executed it.But this part of the prg is running all the time when the prg is running. Can i give a control or enable option to the case structure ? I have tried to write this part as a subvi.But again i dont want to run this always.

In subvi choose the above options and run the attached vi.
Attachments:
Mainvi.vi ‏10 KB
arithmetic case.vi ‏236 KB

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