How can an architectural designer achieve a revision numbering sequence of 1A, 1B, 2A, 2B?

To achieve a revision numbering sequence of 1A, 1B, 2A, 2B, creating a custom numbering sequence for each revision is the correct approach. This method allows the designer to define how revisions are labeled beyond standard numeric sequences. By customizing the revision numbers, you can introduce alphanumeric characters, effectively managing combinations of letters and numbers that follow the desired sequence pattern.

In this case, the pattern requires both numerical increments and the incorporation of letters after each number, which standard options like 'Per Sheet' or simple alphanumeric settings may not adequately support. Additionally, relying solely on automatic options would not allow for the precision needed in formatting these specific sequences, as they typically adhere to a more conventional structure. Hence, designing a custom sequence facilitates complete control over the revision numbering process, allowing for exact details that match the designer's intent.