Hello Chandra,
Please use Tcode RSA1 to create infocube by referencing fields from MPOS using Tcode - /n/SAPAPO/MSDP_ADMIN
This Infocube which you are manually creating can be named as per your needs
Another easy way is by using tcode /SAPAPO/SDP_EXTR -> then click on button - "Data Backup", then click on Generate "Infocube from Planning Area" and provide required details and it will create new infocube.
Additionally for your information - an infocube with name exactly same as MPOS gets automatically created when MPOS is created/activated. Example - Your MPOS Name ZDP_MPOS, you will find infocube with name as ZDP_MPOS in RSA1 as well.
Please read here -
Creating InfoCubes for Use in Demand Planning - Planning Area Administration - SAP Library
Hope this will help
Thank you
Satish Waghmare