Hello Kathleenq,
The WIP limit can only be set for the columns within the Kanban Board.
Per the help page:
Kanban Board | CA Agile Central Help
The WIP value for each row in the table represents a work in progress limit for each column on the board. This value is the maximum number of cards that the team agrees should be in a column at any given time. When this limit is exceeded, the column will turn red. Leave the field blank for unlimited WIP.
Please let us know if you have any questions.
Thank you,
Christian