Policies : Policies > Application Override : Application Override Source Tab

Application Override Source Tab
Select the Source tab to define the source zone or source address that defines the incoming source traffic to which the application override policy will be applied.
Add source zones (default is any). Zones must be of the same type (Layer 2, Layer 3, or virtual wire). To define new zones, refer to Network > Zones.
Add source addresses, address groups, or regions (default is any). Select from the drop-down, or click Address, Address Group, or Regions at the bottom of the drop-down, and specify the settings.
Select Negate to choose any address except the configured ones.
Policies > Application Override