What do you mean by "in same time" ?
Install PeopleSoft Financials and Supply Chain Management 9.2 firstly and then install PeopleSoft Human Capital Management and Campus Solutions
create two database for both
1- Can I used the same Database that already Created during install PeopleSoft Human Capital Management or need to create new one
2- I need to Create New user VP1 in script (dbowner.sql) or used the same PS/PS that already Created.