Filled region boundary: invisible

[Henry D]

I did a search on how to make the boundary of a filled region invisible, but I couldn't find an answer. The linework tool didn't work, is there another way?
Thanks

[Steve_Stafford]

While in sketch mode for the filled region you can choose any linetype you have in your project, invisible being one... Edit your filled region sketch and change the line that you want to be invisible so that it uses the invisible linetype and finish your sketch.