Changing a referenced table without effecting previous data.

I have a excel based timesheet that looks at an external table named "Station Master" to populate columns from a vlookup. I have recently linked the Station Master to a database to populate it. From the database we may change status so that the project does not show up in the station master anymore to make sure complete projects are not getting hours charged anymore. Now if a project that was on the master goes away previous timesheets lose the correct description because it is not on the station master anymore.

My question is there anyway to make the previous data lock so the data that is in the cells won't change when the station master changes.

A little more info... the time sheets are by quarter so 12 weeks are in the same workbook as individual worksheets. All of those worksheets vlookup to a worksheet called "projects" inside the workbook. Then that worksheet references the external Station Master workbook.


Any help would be appreciated.

Yeah that is what I figured. Thanks for the response. I really want to add the time records to the database and get rid of the existing time sheets but I haven't been able to convince the powers that be.