I came across this post while searching for an answer for a copy-paste sketch issue I have. Your video taught me a much better solution. Thanks for your upload. Now have a question with your method. Let me describe my intend and original problem.
I am designing a three store under desk drawer box and its drawers for 3D printing. As I am new, I try to sketch each component at their final assembly positions. This allows me to toggle bodies of other components on and off and cue me what feature I need to add to current component. As the bottom and middle drawers are exactly same i wanted copy the sketches of bottom drawer to the middle drawer. I chose the second shelf of the box as sketch plane. When I highlight the sketch of bottom drawer, the projected sketch of the box also appears, despite only bottom drawer component is active and rest are "blind". With sketch palete tool i can also turn off the profile and projected geometries which will hide them but once i try to copy with any method they pop up. This is the issue I was searching the forum for its reason and solution.
The three pictures are:
sketch. The sketch i want to copy.
Sketch with profile 2: When i activate the sketch, the background profile appears as well
When copied: Even after turning of profiles and projections, with any copy method this appears and if i paste it, it is pasted this way and makes mess.
NOW QUESTION ABOUT YOUR METHOD.
It is great to be able copy everything and not need to adjust or redraw sketches. Though, when I create this new copy, Fusion automatically place it to the bottom plane and copy/move dialogue box opens but it only allows basic move rotate options. I can not managed to make a sketch plane on the second shelf where it should be placed in final assembly. Once accepting the position Fusion suggested, I can redifine sketch plane for all sketches but sometimes this introduces new problems. When the dialogue boxes is active I can not use align tools either. Aligning components/ parts afterwards caused me problem in the past that i keep it as a last resort.
Thanks for the video and your reply to my question in advance.