can we do or there is a way of doing a incremental ID for a Doc with letters and numbers
for example i start with AAAA0001 and next AAAA0002 once i get to AAAA9999 it goes to next letter AAAB0001 and so on
Binary Collections provides APIs for incrementing integers. Your application can format the integers as desired. There is no standard for a sequence combining letters and numbers (in your example four letters and four digits). Likely because there are endless combinations m letters and n digits.