How to properly reallocate Labor Dollars and Labor Hours

I must be doing this wrong.  When I need to move labor dollars & hours, I did a negitive to one cost code and a positive to the new cost code. This ended up doubling my values.  What it the correct way to reallocate "Budget / Estimated" money??  I did this thru PJ/ Enter Estimates.

Any help is GREATLY appreciated!

Thanks- Bonnie