User Number Question

Hopefully a simple one from a fairly in experienced person.

When editing my fixtures I want all my whatever lights to be starting as 301 I go to the top of the column hit set change to 301. Now I have 200 of these same fixtures. I want them once they get to 401 to skip to 501. Do I have to go through the second set of a hundred fixtures individually and have to hit set on each one and enter that fixture number? Or is there some way to highlight them and click set to have them renumber from the first number like I can do at the top of the column.

Thanks,
Matt
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