Adding a nav bounds modifier to a road building

Development Programming & Scripting AI
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Hi
I am making a village builder game and I am trying to make the Unit AI.
I am wanting the player to be able to make roads that the all the units will use.
I am thinking of attaching a nav modifier volume to each road that is placed.
But I cannot find a way to attach a volume to an actor.
How do I spawn a volume during runtime?
Will the volume follow a spline?
Is there a better way?

Thanks

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It looks like there is a nav modifier component that I can add in the viewport. Thanks