DataExtraction - Custom Drawing properties

Dear All,

Is there a way to extract from the Dataextraction command some custom Drawing properties. I mean I wish to extrac blocks from my drawings includings some attributes, Fileneme and a custom drawing property (Filename and custom drawing property are common to all blocks). I can Extract Filename but not the custom drawing property.

If it is not possible, is there a formula to extract a string of character from the Filename (character 5 to 10 for instance)

TY