Hi Amar,
The InfoModeler installation can be done using the PSI on top of an existing Windchill installation or as part of new install. it is part of Windchill base add ons during the install using PSI. As for the documentation, there is no specific documentation for this it is one of the Windchill development components that can be used for customization. Refer the WHC link for more details.
Regards
~Syed