record Working time as a standalone system

Dear all,

we have a requirement of recording working times of employees through Portal (ESS) and approve working time. i checked the CATS (Configure ESS for Time Entry) and our requirement is similar to it but in CATS i read " after its approved it is transferred/updated to HR systems". we dont want to update any existing systems (HR/MM/PS) the data should exist as a standalone and report will be generated on periodic basis without effecting any other systems. is there any possibility in CATS or ESS to achieve this.

Thanks,

mahesh.