I used to use turbo lister prior to making the switch to auctiva. My problem is that if I have a buyer who purchases some books from the old TL ads and some from the newer auctiva ads, it will not let me combine their invoices into one, and if I manually adjust one of the invoices to reflect the additional purchases, when they try to pay, it takes them back to the original amount...how can I get the purchases from the TL ads, and Auctiva ads to combine on one invoice?

I would send an invoice directly through Paypal..
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You'll need buyers email addy and possibly item numbers (forget, it's been awhile since I sent one) But this way you can bypass all the confusion with TL and Auctiva.