Not sure if this is what you mean..........
Entered as an alongtrack waypoint at L1, for example, W010-5, which should give the W010 point on you flight plan track (assuming there is one, like from the US to Europe) and then also a point every 5 degrees (W015, 020, 025, etc) until the end of the route.
So the number after the dash/minus is the interval.