Remove 1st dialed digit in Vector collect step?

[kgiber]

I am trying to find a way around users using putting a 1 in front of their extension when dial by extension. Not everyone is used to their extensions being 11 digit so the collect step I set as 10 and CATL a "1". Potential issue I see though is that this could cause issues as some users may also enter a 1 then their 10 digit extension (despite the announcement stating dial just 10)

Here is the steps to add the "1" and it works just fine
10 collect 10 digits after announcement 1030135 for none
11 set digits = digits CATL 1
12 route-to digits with coverage y

Is there another command like CATL that removes the first dialed digit on the left? I assume SUB just subtracts openand2 from openand1 (ie converting 123 456 7899 to 123 456 7898)...