You have to load the Master profile before you do anything else..you should even see a warning pop up telling you it will overwrite anything that is already there.
As for the tax table, sorry, don't know anything about that one
Member_8880 is right on point with has answer to your question regarding the master profile.
Also, in order to use your eBay tax table in your Auctiva created listings, you just need to check the box next to "Use your eBay sales tax table" in the "Checkout Options" section of the Auctiva lister page.
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