To do this follow these steps:
Open Groupwise
Go to Tools, Options
Double-click on Security
Click on the Proxy Access tab
Click on the book icon
Scroll down, find the name of the person you want to share your calendar with and double-click on it.
The name should then appear in the right pane
Click OK
Highlight the name of the person you just selected
Give Read and Write access to Appointment, Reminder Notes, and Tasks by clicking in the little squares beside them
Click OK
Click Close
The person you just shared your calendar with has to do the following steps:
Open Groupwise
Go to File, Proxy
The following 2 steps only need to be completed once - after that, your name will appear in the list each time they go to Proxy
Click on the book
Find the name of the person who shared their calendar and click once on it to highlight it
Click OK
Highlight that name in the list again and click OK
That person's Groupwise account will now show up instead of your own - you will only see what you have rights to see.
To get back to your own mailbox, click on File, Proxy and choose your own name from the list
Click OK