Q05 Premier - Update Cost Basis

I recently re-allocated my 401(k) portfolio and downloaded the transactions into Quicken 2005 Premier. The "adds" worked fine, but the debits / "removal"s subtracted money from the fund as expected; however, the "cost basis" did not automatically update to relfect the reductions/withdrawls. As a result, Costs Basis vs. Portfolio Value is incorrect. Any advice/insight as to how to update/correct the "cost basis" to reflect the correct total would be greatly appreciated. Thanks! Paul