Pick a projection and set its options as needed.
Available projections are listed on the left. Settings for the selected projection are listed on the right.
To define the settings for the projection you must select items such as units or direction by clicking the down-arrow for the option and selecting a value from the list. Values can be typed in the fields.
Procedure
1. Select a projection from the list.
2. Modify any necessary options.
3. Click Finish.
The modified coordinate reference system is saved. It will be displayed on the Custom tab with the name coordinate reference system plus projection plus (variant).