Setareh sh,
Been there, done that. I was not allowed to fire the idiot who made it all necessary.
[ol 1]
[li]Create your plane using whatever geometry you want attached to it.[/li]
[li]Create a 3D sketch. I draw an "L" shape with both lines on the plane.[/li]
[li]Edit your 3D sketch, disconnecting it from your plane. You can define each of the three points from your primary planes.[/li]
[li]Move your sketch to the top of your feature tree.[/li]
[li]Edit your plane, using the three points of your "L" sketch to define it.[/li]
[li]Move your up the feature tree to just below your "L" sketch.[/li]
[/ol]
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JHG