Custom fields open more fields when filled
It would save a lot of space to be able to have custom fields where, if selected, they would open up other custom fields. But if not selected they would be hidden.

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Chad commented
We’re running into a problem with the 50 entry limit within an “options/drop down” style custom field. If the 50 entries limit can’t be increased which means more custom fields need created, the feedback/idea posted here could be very helpful, e.g.: if have fields for a specific manufactures style/model, then when choosing that field, a “related” field could be populate with specifics such as color, size, etc. options for that manufacturer. We’re a roofing company, but the application could be helpful across many industries.