Help with understanding actions and Batch options

I created a set of actions to open a RAW file, set to auto, save for web and then close the image.

This all worked well as I wanted to save the image for web at 1920px. I now want to save jpgs as the size it is in RAW 6000px approx.

To that end I then recorded another set step that saved at that size, but having gone to the trouble of setting up a previous step that saved at a lower size.

Can I do the following.

Run the action group and say, DO NOT RUN the 1920 step. Is there a way to turn off steps and not execute them, or do I have to create a new action set by recording save at 6000px and copy the open RAW/Close steps as a new set?

I can see that there are check boxes, next to steps that you can click on and they then have a little square icon appear, I cannot see what this means, anywher.

Any kind help appreciated. Thanks.