ETC Cobalt Family v7.0.0 - Manual (Page 376)

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4. In the Advanced dialogue, select the renumbering option "Keep original spacing and gaps" or
"Convert to consecutive numbers" and enter a "start at" number for the first preset.
Keep original spacing and gaps will keep preset numbering as it was in the old play, using the start
at value to create an offset. For example, if you drag in presets numbered 1, 1.5 and 3 into the current
play with a start at value of 5, the new presets will be numbered 5, 5,5 and 8.