you will do this with Dynamic form Ruyles
Condition
When [My checkbox field] is true
Action
Make Required [My text field]
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You didn't seem to be asking a separate question as to whether there is such a thing as a Formula Multi Line field type. The answer is there is a formula text field type and if you want that text to appear on separate lines for some reason then you would have to build that into your formula. There is syntax to create a new line in a text formula the field.
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Mark Shnier (YQC)
Quick Base Solution Provider
Your Quick Base Coach
http://QuickBaseCoach.commark.shnier@gmail.com
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