Client WIP balances are entered as WIP transactions in Time and Expense Entry. When entering these transactions, the dollar amount may not calculate to the exact WIP balance. To resolve this, you can override the calculated amount by simply entering the desired amount in the Amount field. Note that the amount will turn red to denote that the calculated amount was overridden and it will not recalculate if you change any other variable on the transaction.
If you will not be assigning the beginning balances to particular engagements and activities, you may want to use a default engagement and create a Beginning Balances activity to be use. You may also want to create a Beginning Balances staff member if you do not want to associate the beginning balances with particular staff.
Note that whatever method you choose, you may also want to consider separating out the portion of the WIP balance that is progress billing and entering that separately as progress bills in Practice CS. Outstanding progress bills effectively act as a charge against future WIP transactions, and as such create a negative WIP balance. If a client has outstanding progress billings, and you don't enter them separately, then the outstanding WIP transactions are effectively reduced by the progress amounts (i.e., the progress bill amounts are too low, as are the outstanding WIP transaction amounts). Example: If a client has $300 of unbilled WIP transactions, as well as an outstanding $100 progress bill, the net ending WIP balance is actually $200. If you enter $200 as a beginning WIP balance, you have lost the true picture that there is really $300 of WIP and a $-100 outstanding progress bill. If this is a concern, then you should enter the actual WIP transaction amounts and then the progress billing separately, which will net to the proper balance.