Modify / Creating line style in OpenRoads Designer

Hi

I need to modify or create a new line style. In ORD line style library ( pavement marking) there is one called "Pawt Mark 300mm W - 0.6m Dash 0.6m Skip"

What I need is one who is "Pawt Mark 300mm W - 1m Dash 1m Skip"

How can I do that?

regards

Sigfús