I'll start by saying that I'm not the most experienced SolidWorks user. I've been using FloWorks for a little while now and this is the first time I've encountered this particular problem, so any insight will be appreciated. I've been trying to create lids in my model, but can't in certain locations. Most of these (except for one) are places where the entering fluid would mix with other fluids. (Actually, I'm not even going to have any mixing, just trying to have an accurate representation.) Can FloWorks do this, or is that my problem? Also, please list any other reasons that you would NOT be able to create a lid.