When it is about any software efficient use there are 2 rules
1. You can't use the software efficiently unless you read the complete user manual
2. Nobody read the bloody user manual

Seems you proved rule 2

You can import and export any input (suspension points coordinates, heave, roll, pitch, steering or combinations of 2 or more of these motions, etc..,) or output to or from an Excel spreadsheet. That Excel spreadsheet format is already included in Optimum Kinematics package.
Now, nothing prevent you to make an automatic macro between OptimumKinematics spreadsheet and yours or between your SolidWorks or Catia coordinates and the OptimumKinematics spreadsheet as an pre-simulation step.

Hope this helps.

In any case, please know that you can always ask your questions directly to OptimumG staff and in most of the case you will have an answer within 24 hours