To use an existing record as the basis for a new record (to save typing similar information all over again) you can copy the existing record as a 'cloned' record (aka a different edition record).
To clone a record:
In a record that you wish to clone:
Choose File | Clone record; or press <Ctrl+Alt+O>
Select a template from the list that displays, and press OK
RIMMF will load the record being cloned into the selected template:
Make necessary changes to create a new record
Notes
In RIMMF, the 'clone' process will:
Copy the current record
Assign a unique record control number to the new record