I am trying to create a list that auto numbers each row. I have to duplicate
one column into another, but change the last letter in the string from an "A"
to a "B". Where I get tripped up, is when the column changes from 1A, 2A,
etc. to a double digit 10A, 11A, etc. I tried using =left(text, 1)&"B", but
when it goes to double digit numbers my solution fails.

Basically I have data in column A and the same thing with the last character
change needs to go into column E. So it should look like this:
A B C D E
Tube MRN ACC Tube
1A 0000 00-000 1B
2A 0000 00-000 2B
3A 0000 00-000 3B

Thanks for any suggestions.