Need to make a tag a required field in certain categories only in the transaction sheet

Can someone please help? In the transaction sheet, I need to make some, but not all, categories have a required tag field. I would prefer that it requires a custom entry, but show as an “error” should the tag field be left blank for CERTAIN categories. Other categories to not require a tag. Thank you.

@amitnzn, there isn’t really a way to make it show an “error” but you could use some conditional formatting to highlight the cell with the color red if a category requires a Tag. I don’t know how to set up the formatting rule, but perhaps that will give you a starting point for doing some research via Google for conditional formatting.