i’m trying to model a suit of Power armor in Zbrush. I have a base mesh in Maya that i’ve imported into Zbrush, but it has edges and lines where there should be none. Also, when dividing i know you can turn off Smooth, but the crease tool doesnt let me select an edge loop to keep sharp. Any help would be appreciated.

See if Maya’s obj exporter has an option to keep everything as quads or covert it to tris. It looks like your quads got converted to tris.
If you want a corner or edge to stay hard, you need to add edge loops close to those areas in Maya so they stay crisp. If you subdivide your model in Maya it will give you an idea of what subdividing in ZBrush will look like. So anywhere you see a corner or edge that looks too rounded once it’s subdivided in Maya, add an edge loop to tighten it up.
k, thank you