Converting 3/4 to 6/8

Is there an easy way to re-display 3/4 to 6/8 where the music notates and bars correctly. A short example: two measures in 3/4 of half note, quarter note… I’d like it changed to one measure of quarter, eight, quarter eight in 6/8. Any thoughts?

Just press shift-m, enter 6/8. Then, with insert mode on, half the note value with Ctrl+Shift+Alt+left arrow (cmd instead of ctrl for Mac)