::Darrell, I did some research for you and all that I can find is that we can merge customers and vendors as a standard feature in BC.
I could not find anything, even an Appsource solution for your problem.
I do have some good developers that could write a program for you.
Alternatively, I would block one account and just use the other. Not elegant and the transactions from the blocked account will not move. If the issue is that these are P&L accounts, you could do journal entries by month the total of each month before you block the account. You can also put both accounts on one line of your income statement.