best I came up with
create a Text FIELD named SerialNumber, set auto enter on creation next value 0000
create a calculation field cRecordID with the calc set as below.
Right( Year ( Get ( CurrentDate ) ); 2) & If( Month(Get ( CurrentDate ))<10; "0"& Month(Get ( CurrentDate )); Month(Get ( CurrentDate ))) & SerialNumber
SerialNumber will auto create the unique 4 digit suffix and cRecordID will calculate your ID string.
You don't need to display SerialNumber anywhere just use cRecordID.
Awesome, it worked perfectly. Thank you so much, I never would have figured that out.