Hi @Mateusz Czuchrak
Are you using Team or Company managed projects? Company managed projects should allow you to but team managed may not.
Sub-tasks also have other limitations around archiving deleting etc.. Usually from the experience I have gained with them recently I wouldn't recommend them for anything over 2 points, 1 would be optimal. I would actually recommend making a higher level beyond Epic and then creating hierarchy from there.
However there are more limits with Team managed projects with company managed.
Best,
Clark
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