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There is probably nothing you need to create. You did not say what version of editing software you had before PD16. The box and shove transition are all there. You need to place them between 2 clips. Click on the transition and hit modify to change the direction as shown in this video at 05:20: https://www.youtube.com/watch?v=EVsYnnaHO5k .
Thanks Tomasc for your reply.
I just found Shove Wipe and Slide that satisfy 5,6,7,8 pretty well
and now I found box (albeit just box rather than circle as an option)), but 3 and 4 where in and out are scaled is still a challenge
Not as much to search for as I had thought - but this is turning out to be what PD seems all about - super feature rich and probably what you want is in there somewhere.
My original editor was Movavi, this is my first experience of PD.
Many thanks.