Sul G, E etc

Hi, so does anyone know how to write the (sul G)-------- marking? Or it’s not yet present in Dorico?

One can create a playing technique and make it a default if one wishes, or one can use the line tool.

One can add a Continuation to the playing technique in properties, although the line will be solid rather than dashed.

As @Derrek says, add a playing technique (but the continuation style can be changed to dashed, or anything else, in Engraving Properties>Line Style)