You can create your own coordinate system, the following is from the help file, search coordinate;
You can define a coordinate system for a part or assembly. Use this coordinate system with the Measure and Mass Properties tools, and for exporting SolidWorks documents to IGES, STL, ACIS, STEP, Parasolid, VRML, and VDA.
To create a coordinate system:
Use the Coordinate System PropertyManager to create the coordinate system.
You may need to locate a coordinate system where there are insufficient entities available to define the coordinate system. In this case, you can define a coordinate system someplace on the part or assembly that does provide the entities you need. Then you can move the new origin to the desired location. The new location must contain at least one point or vertex.
To translate a coordinate system to a new location:
Define the coordinate system at a location on the part or assembly that provides the entities you need to control the angle and direction of each axis.
Click in Origin, then select the point or vertex to which you want to translate the origin.
Click OK. The origin moves to the location that you selected.
When you create a coordinate system, it is a good idea to give it a meaningful name to explain its purpose. Click-pause-click the coordinate system’s name in the FeatureManager design tree and enter a new name.
To toggle the display of coordinate systems:
Click View, Coordinate Systems.
To hide or show individual coordinate systems:
I know this topic was posted awhile ago but I am currently wondering the same thing. Were you ever to solve this?