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I'm assuming you're using OpenStudio, since your other questions on Unmet Hours are on that tool as well. Under the Constructions tab, you can create F-Factor Ground Floor Constructions (reference screen shot below).

F-Factor Ground Floor Constructions in OpenStudio

You'll notice that there are only input fields for F-Factor, Area, and Perimeter Exposed. The only way to apply one instance to your entire model is IF all perimeter spaces have the same values for all three inputs. You will need to make a new instance of an F-Factor construction for each new combination of the three inputs.

There have been other questions about F-factor implementation:

HERE is one about how to potentially create F-factor constructions using measures

HERE is one about an error in the ASHRAE table for F-factor values to use according to horizontal insulation

HERE is one about cases with both horizontal and vertical insulation, as well as an external ground heat exchange modeling tool you could use to report F-factors for cases that don't match the ASHRAE Table

I'm assuming you're using OpenStudio, since your other questions on Unmet Hours are on that tool as well. Under the Constructions tab, you can create F-Factor Ground Floor Constructions (reference screen shot below).

F-Factor Ground Floor Constructions in OpenStudio

You'll notice that there are only input fields for F-Factor, Area, and Perimeter Exposed. To be more exact, you should create a new instance of this F-Factor Construction for each perimeter space that has a difference combination of the three input parameters. The only way to apply one instance to your entire model is IF all perimeter spaces have the same values for all three inputs. You will need to make a new instance of an F-Factor inputs, or you want to simplify this process and assume the same construction for each new combination of the three inputs.all perimeter spaces.

There have been other questions about F-factor implementation:

HERE is one about how to potentially create F-factor constructions using measures

HERE is one about an error in the ASHRAE table for F-factor values to use according to horizontal insulation

HERE is one about cases with both horizontal and vertical insulation, as well as an external ground heat exchange modeling tool you could use to report F-factors for cases that don't match the ASHRAE Table

I'm assuming you're using OpenStudio, since your other questions on Unmet Hours are on that tool as well. well (if you are, please add a tag for openstudio). Under the Constructions tab, you can create F-Factor Ground Floor Constructions (reference screen shot below).

F-Factor Ground Floor Constructions in OpenStudio

You'll notice that there are only input fields for F-Factor, Area, and Perimeter Exposed. To be more exact, you should create a new instance of this F-Factor Construction for each perimeter space that has a difference combination of the three input parameters. The only way to apply one instance to your entire model is IF all perimeter spaces have the same values for all three inputs, or you want to simplify this process and assume the same construction for all perimeter spaces.

There have been other questions about F-factor implementation:

HERE is one about how to potentially create F-factor constructions using measures

HERE is one about an error in the ASHRAE table for F-factor values to use according to horizontal insulation

HERE is one about cases with both horizontal and vertical insulation, as well as an external ground heat exchange modeling tool you could use to report F-factors for cases that don't match the ASHRAE Table