@Salava: I understand how to decrease the entire terrains vertex count, but that would defeat my purpose. Some of my terrain does need to be high-poly, such as clifs, and hills. However, using 100 polys for a piece of flat land makes no sense at all. That is what I am trying to do, reduce the vertex count in only a select few areas.

@Ulillillia: My method of creating terrain is as follows:

1. Set the flat plane in HMP.
2. Create a general floorplan in HMP:
3. Convert to mdl.
4. Add features that were not possible in HMP.
5. optomize and skin
6. Import into WED, and add any other detail needed via external models.

I am in between steps 4/5 at the moment, so it is in MDL format. However, I dont see a subdivide or reduce function for models period. I guess I will do this by hand.

Thank you everyone for the replys. Question mostly answered .