The Orbital toolbar has room for 10 ideas at a time. To make more room, you can click the close button that appears over ideas on the toolbar when you hover the mouse over them in the workspace. Clicking this button does not delete the idea, it just removes it from the toolbar.
Ideas that are no longer on the toolbar are still available as a webpage if they have been shared and can be found via the Orbital Warehouse workspace search bar.
You can copy an bit from one idea to another by holding down the shift key and dragging the bit to another idea. Moving a bit around the idea it is attached to will change the order in which those bits are displayed on that idea's sharing page. Bits are displayed in clockwise order, starting at the top of the idea.