Connection to Civil 3D

We have recently made the transition from HoleBASE to OpenGround. There are a number of Civil 3D files with connections to HoleBASE that I now need to connect to OpenGround. Is there a way to easily connect these files to OpenGround without having to entirely create a new drawing in order to make the new connection. 

In short I would like to be able to break the connection to HoleBASE and then connect the file to OpenGround. 

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