Interaction with cplex bnb

Hello everybody

Is there a way to interact with cplex when using it with gams?

What I would like to do is, to read the solution to a B&B node, fix some variables and ask Cplex to obey the changes.

If i can access the variable values, will I get them in the form x(a,b)= …, the way they are modeled, or just numbered like var(100) = …?

Can I somehow restore the relationship var(100) means x(a,b)?

Thank you