By messing around with Sketcher+Extrude and Cut, I managed to get fairly close to what I wanted: SurfboardPatternsComparison.png Unfortunately, the layering of identical sized objects in the same space is messing up the colors. When I tried to cut out the unneeded purple sections to fix this problem...

Just to confirm, this is a stable release for the MacOS system? This has happened every time I have tried to start the program.

The documentation page mentions 0.19, but it keeps linking to a download labeled 0.18.

Where is the actual 0.19 version for download?

I tried to add the Curves workbench, but am not having any success. My first attempt was to use the Add-on Manager, but it just seems to stall loading a never ending list of add-ons and won't move until the process is complete. It never completes, so I can't go looking for the one I need. I next tri...

@hammax
Is that a full size surfboard?
That would explain the program struggling, as it tries to load a life size object.

Mine is a toy size one, so the memory demands aren't that intensive.

I want to sketch a pattern on the surface of a surfboard object I am designing: Does anyone know how I might go about doing this?
I haven't done this before.

I am wanting to apply a series of evenly spaced vertical grooves to this cylinder: But I want the process to be automated, it would be far too intensive to manually add each groove, as there will be many of them.

Does anyone know if a tool exists to modify this cylinder this way?

I was selecting multiple objects and pressed a key combo while doing so that caused this to appear: I could not figure out how to disable it and wish to do so.

I tried the recommended Macro, results were inconclusive: The single design on the right it worked for, the dual design on the left, it didn't.

Now I am very confused......

Thanks for the Macro recommendation.
Hopefully it will be useful for my next project.

I did try the Box Select tool, but it wasn't reliable, it only picked random isolated elements and not the entire sword/design.
So I won't be trying that again.