Firm split - how to separate database

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Hi,

We are using Timeslips 2015.

Our firm split, with some clients going to the new firm (I'll call the remaining firm, Firm A).  However, Firm A will continue to collect on all balances due up to the date of the split, which was February 10, 2017.

I have created a new Firm A database for all billing beginning on February 11.  Per the partner's request, all new billing in the old Firm A database will cease, and the A/R will run through February 10.  Going forward, however, he wants the new database to NOT include any A/R from the old database, and only have the A/R data from new billing starting February 11.

Some clients remaining with Firm A have previous balances through February 10 and new time starting February 11.  How can I include previous balances from the old database on new bills in the new database without including them on the new A/R report?  If this isn't possible, is there a way to create a third database with old balances and new billings and just run the bills out of that?

Any suggestions will be greatly appreciated.  Thanks in advance for your help!

Sharla Toigo