If you have a single document it seems like this should be able to be done without macros?

I have one text box with a field {SEQ SerialNumber \r 10000001 \* MERGEFORMAT}
This field has been bookmarked SeqNumBookmark.

I have a second text box with a field {SEQ SerialNumber SeqNumBookmark \n \* MERGEFORMAT}

I've tried lots of different things but the second text box always has the same sequence number as the first: 10000001

Also, is there a way to print leading zeroes? I saw how it was done with the macro but not sure how to do it with a field.