To Designate a Cell as an Active Cell Using the Cell Library Dialog

From the Primary Tools toolbox, click Cells. The Cell Library dialog opens.
(Optional) From the File menu, select Attach File.
The Attach Cell Library dialog opens.
(Optional) Select a cell library and click Open.
In the list box, select the name of the cell.
Right-click the cell and select Place Cell, Place Terminator, Place Point Cell, Pattern Linear or Pattern Area from the pop-up menu.