To Add a Cell Selector File

Select Drawing > Annotate > Cells > More split button.
If a cell library is not already attached, the Select Cell Library to Load dialog opens.
(Optional) In the Select Cell Library to Load dialog, select any file and click Open.
The Cell Selector dialog opens. Each cell in the attached cell library is displayed on its own button.
From the File menu, select New.
The Define Cell Selector File dialog opens.
Type a file name and click Save.
The Cell Selector dialog is blank; no cells appear on the buttons.
From the File menu, select Save.