Disassociate a Ruleset From a Selected FTD Device

If you want to add a new device-specific rule to a ruleset in an FTD device, you need to dissociate that ruleset from the FTD, which converts its associated shared rules to local rules. Then, you can add the rules that you want to local rules. 

1. In the navigation pane, click Devices & Services. 
2. Select the device that you want from the list and in the Management pane on the right, click Policy.
3. Click the  icon appearing on the top right corner of a ruleset. 
4. Click Confirm. 
5. Review and deploy the changes you made, or wait and deploy multiple changes at once.