You can access the Plan Assignment Rule sub-module by clicking Plan Setup > Plan Assignment Rule from the LHS menu. Upon clicking this link, the Plan Assignment Rule page is displayed as depicted in the following figure:
The Plan Assignment Rule page displays the existing list with details such as Rule ID, Model From Payee ID, and Model From Plan ID.
You can click the 
button to view the additional fields such as Modified Date, Created Date, Rule Description, Rule Documentation, and Model From Plan Start Date.