Drop down menu

hello!!

I want to make a drop down menu with rounded corners. But when I make all corners rounded, on the joint of level 1 drop down and level 2 becomes a space.
so HOW can I remain the corners on joint of two levels pointy, while make all others rounded?

here is a picture: https://drive.google.com/file/d/1uexja0mNGdmq48rP2rjauQE6cHqwXE5h/view?usp=drivesdk

on it circled corners should be pointy and all the rest rounded.
please help!!!??????

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