Hi Gagan
let me answer u the for following questions
1) Yes, In ESS Record working time & leave request are both separate services and u can use them without any issues. for those both the workflows will be different. for leave request u can set the workflows in V_T554S_WEB & for Recording Working time in CAC1.
2) u can set the period type settings in CAC1, where u can restrict to weekly or monthly or daily.
3) Normally CATS life cycle goes like this.. Initially employee book his attendance in CAT2(here ESS), after that manager approves/rejects it from CAT4(here MSS). now to transfer the data we must use CAT6. unless u don't use the data won't get updated in HR. Normally we run a background job for this program RPTEXTPT (CAT6) and set a frequency for this. so then the system will automatically updates the record in HR & corresponding Infotypes.
4) for CATS config u need to use CAC1 & CAC2 for maintaining all the required settings. and to run complete life cycle in CATS check 3) ans.
Kindly close the thread (by clicking correct answer) if u feel that u have got ur answers, as this will be helpful for all SDN users to find/reply answers to ur thread.
Hope this Information will be sufficient
Cheers
Pradyp