If you need to have the start up methods run in a specific order, something is wrong with your analysis of the problem.

That said, change your naming convention from 'sub name_that_makes_sense{}' to 'sub startxxx_name_that_makes_sense {}' and replace the xxx with the order of starting number (000, 001, ... , 998, 999). (But I'd go back to the problem analysis and ask "Why are things order-dependent? If A simply MUST come before B, then why are they in different setup-routines?")