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What should be done to save the changes to the user defined work plane, as I am able to adjust the size of the user defined work plane in a part file, but when I save and reopen later the size of the work plane goes back to the state prior to edit.
After adjusting the work plane size in the part file go to tools menu and select rebuild all and then save the part and close. When next time you open the part you will see that the size of the work plane will be same as defined by the user.