ID user problems

I have two questions about payroll oprtion in vantage 6.1 (database progress 9.1D)
1. Somebody when create new ID made mistake (user ID is 123 instead 0123). This user is only office user (no trasactions on it). Is possible change this ? Maybe good idea is remove this id and recreate again if this user doesn't have any transactions ?
2. Second thing is more complicated. I have to change ID for user with a lot of transactions. He is shop floor user and he has many clock in and clock out transactions. I have idea like create new ID and copy somehow transations from old ID to new one. Is possible to do that ?
Is database keeps this data only in one table ? Maybe somebody did this change before ?
Thx For help


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