Auto Assign a Predecessor in Gantt

Hi,
I have a series of standard processes that have the same dependency and predecessor data each time.
I have the primary column as a job number, and then a second column with a drop down list of all the standard processes (I.e. assembly, pre-assembly etc.).
If pre-assembly is selected, for example, I always want it to start 2 days before assembly. Is there a formula that can go in the predecessor column that would automatically fill the cell with "-2" in this column when you select pre-assembly? And then when I put a start date in the assembly section, it will obviously self generate the pre-assembly date...
Does this make any sense? Please let me know if it doesn't...
Comments
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Unfortunately you can't use formulas in any columns that are used for the dependency settings.
You could however disable dependencies and then use formulas to automate the dates.