This may be the l"long way home" but what I do if I've already completed my own company's file and I'm choosing to go in after the fact and do my tax-mapping in preparation for tax season I'll comb through the chart of accounts and right click, select "edit" and map each account individually.
If somebody knows a faster or 'bulk' way to achieve the same result I'd be interested too but I find that going account-by-account is the most careful way to get my books right anyway.
Best of luck if you haven't figured out what you needed figured out yet sir.
