STP File Size Reduction

I have a STEP model whose file size has ballooned, largely because it contains many separate components. Before I run my analyses in ANSYS, I need the file trimmed down without losing the geometry that matters for simulation... (Budget: $10 - $30 CAD, Jobs: 3D CAD, 3D Design, 3D Modelling, 3D Printing, 3D Visualization, CAD/CAM, Mechanical Engineering, Solidworks)