Custom System object creation in EP 7.31

Hi all,

We have upgrade portal from 7.0 to 7.31 .

We have one system created for accessing non sap application .

This system is cutom one created from PAR file.

But in 7.3 while creating system we not able to see multiple option like EP 7.0.

in EP 7.0 we have 3 options  1. system from Template 2. System from PAR  3. from Folder.

But in EP 7.3 i can see only one option that is system from Template.

Then how can i create my custom System?

Any suggestions?

Thanks in Advance,

Prasad.