In the Customize User Interface (CUI) Editor, Transfer tab, in the left pane, click the Open Customization File button.
In the Open dialog box, locate the customization file (MNU, MNS, CUI, or CUIx) from which you want to import customizations, and select it. Click Open.
In the right pane, click the Open Customization File button.
In the Open dialog box, locate the customization file (MNU, MNS, CUI, or CUIx) to which you want to export customizations, and select it. Click Open.
In the left pane, click the plus sign (+) next to an interface element node to expand it. Expand the corresponding node in the right pane.
Drag interface elements from the right pane to the appropriate location in the left pane.
Note: Interface elements can be dragged in either direction, from left to right, or from right to left.