Your message suggestes your on an earlier version than WF1? - in WF I perform simple sweeps through the VSS Sweep [just select a single traj or use the option constant section] option to functionality this gives you the dashboard with the solid, surface, cut or thin options.
To reuse a sketch: whilst in sketcher hit the save button - this will save a section [.sec] file. Then, this can be imported to any other sketch environment: sketch > data from file.
A more robust way is always to create more time consuming sections as datum curves [which can then be referenced in the sketch] then they don't get lost if the feature is abondoned or fails.