Filter a wms request to Geo Web Publisher

Is it possible to filter a wms request to a BGWP reuest base on the origin dgn file name (or other attribute the objects might have) the objects come from?

For example if I create a dpr, idpr, tpdr or automated idpr connect from a set of dgn files (for example test1.dgn, test2.dgn). I create a graphical source to it. I create a wms-layer in my map connected to the graphical source.

Then from the client I would like to make request to the wms layer that I only would like to see the test1.dgn information. Is that possbile?

One solution would to create one layer for each dgn-file, but when having thousands of files that dont feels like a good one.

Br
Mike