First if you are using strickly a boolean...... Only "Yes" or "No" then do you really want a Combo? Now if you want to leave room to expand... by having the ability to add a third choice... for example.."Undecided" then I would use a combo. But for strickly a "Yes/No" then consider an option group. I attached a db to show you what I mean.
Also... "bonekrusher"....
if me.combobox = yes then
me.txt4 = P
else me.txt4 = ""
end if
This code would return nothing for "No"
I was trying to give him/her the basic code. P in this case could be either a variable or "p". If he/she wants no to return a value, he or she would have to add that in the else. It was only an example.