We have created an User Defined filed to unclude Cable Numbers in our schedule, eg. 10CVB1001BTBV, 14BFB1001HTBV, 12CVB7001BQBV, etc. We want to change the first digit in the number from 1 to 2. It is approximetely 16000 activites. Is it possible through a Global Change or by any other means?