Suppress Formula Fields And Text Object In Crystal Reports

I have a formula field on crystal reports. I wants to check it whether it may consists

negative value or not if it has negative value t开发者_StackOverflowhan suppress it or hide it.

My formula field name is "Bal" which consists formula is as below:

WhilePrintingRecords;
Shared NumberVar mytot;
mytot:={@TotalSale}-{@TRPurchaseTotal}

How to suppress Formula field and TextObject?.

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Right click on the Bal formula in your report -> Format Field -> Common tab -> Suppress formula: currentfieldvalue < 0