Edit .dra to add new pin with netlist name

Hello, I have two .dra files with custom ICs with some pins. Now I am trying to edit this files in Package Designer to move some pins and connected netlist names from one .dra file to the other. After this I want to use this files in my .brd file. But how can I add a new pin in my .dra file with a netlist name and how can I delete one and remove the netlist connection of this pin from the dra file?