How do I make fields condtional?

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I am building a large inventory of urban trees to be used for tree condition assessment purposes. In the "Inspection" table, there is a field called "Significant" which is a boolean 1-Yes 0-No. Not surprisingly, the "Significant" field represents trees of significant importance.

I have other fields which I ONLY want populated when "Significant" is populated by 1-Yes. These fields include "Rem_Mod" (Can the tree be removed or modified? Yes or No), "Sig_Type" (Signficance Type: historic, cultural, memorial, etc.), "DBH" (Diameter at Breast Height), Crown_Sprd (Crown Spread). If the "Significant" field is populated by 0-No, then these 4 fields can be left null.

I've looked into Subtypes, and I don't think this is what it is intended to do.

I'm at a loss of what to do. Does anyone have any suggestions on how to make these 4 fields conditional upon the tree's significance?



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