>Can anyone tell me, is there an easy way to delete all characters 
>other than numbers from a field member?

There's lots of ways. For example:

newtext = ""
t = member("text field").text
c = the number of chars in t
repeat with a = 1 to c
   if "1234567890" contains char a of t then put char a of t after newtext
end repeat
member("text field").text = newtext
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