Perhaps you could relabel your racks to identify tiers...

01A-1 bin1, level1
01A-2 bin2, level1
01B-1 bin1, level2
01B-2 bin2, level2
01C-1 bin1, level3
01C-2 bin2, level3

Optionally, you possibly don't need the hyphen at all...

01A1 bin1, level1
01A2 bin2, level1
01B1 bin1, level2
01B2 bin2, level2
01C1 bin1, level3
01C2 bin2, level3

--
Garry

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