I apologize - I do think this should be a basic question that I could answer myself, but I cannot. I am new to Smartsheet so still learning.
I see that you can set a field to Text/Number, but how do I restrict a field to only allow numbers to be entered? it's a field for a customer ID - that if someone attempts to type text, it would not be allowed - only 3 digit numbers. Both in the sheet and the webform.