You'd use the MIDDLE function to grab the value you want.
You could create a series of variables to hold each extracted number (or fields). If your original value is always a fixed number of digits the easiest method is to probably have a few set variable (or field statements) to grab each value or you could loop through a value of changing length.
Bottom line - middle
i am trying that as we speak.
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thank you, all sorted. no further responses required.