Alternate revision scheme?

Hi,

We have set up our PDM to follow a revision scheme starting at 1, then going to 2, 3, 4 etc as you up issue.

We now want to implement development revisions following on to production revisions, ie. we want to start a part revision at A, B, C during development, then when the part is released for production, change to 1, 2, 3 ,4. (So you can follow the revisions from development to production as A, B, C, 1, 2 ,3)

Thanks

SolidworksWorkgroup Pdm