Quotes: auto-increment more than 1 at a time

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Hi

Instead of having a sequential auto-increment value for each quote, is it possible to increment in intervals of 5? For example: 5, 10, 15, 20, 25, 30, etc?

I know how to set the next auto-increment value through MySQL but no clue on how to increment more than 1 value at a time and no idea if this is even possible.

Thank you