Steps to save a dimension from a process map.
Right-click the selected nodes and click Save Dimension. The Save Dimension As window appears. The default save location is the User*profile name*\Dimensions folder.
To create a new dimension based on multiple nodes, Ctrl+click and drag to create a box around the items that you want to select. Right-click the box and click Collapse to a single node. Right-click the collapsed node and click Save Dimension.
In the File name field, type a more descriptive name for the dimension and click Save. You now have access to this dimension from any dimension list.
If you would like all users of a profile to use the dimensions that you save, you must upload them to the appropriate profile using the Profile Manager. See Publishing Files to Your Working Profile.