Clear a public object without destroying it

[RS_Arm]

Hello.
Here's my problem:
I invoke this object from a DLL ("mdiform1.Motor.ObjDocLiq") in a mdiform. This object is declared as Public in the dll
("Public ObjDocLiq As New GcpBE601.GcpBEDocumentoLiq")

Then, I need to use it on other childforms

My question is:I need to clear the object content without destryoing it.
Can I use "set mdiform1.Motor.ObjDocLiq =Nothing"?
If you got any way to do it, please tell me.

Thank you all.