Hello Rajaram,
For any query regarding Payroll, it would be preferable if you would indicate for which Country, as Payroll is Country dependant, and some things that are possible for a Country may not be so for an other Country.
I've never worked with SAP's Travel Module, but I would presume that it is possible to read it's information during Payroll Processing (since some employers would do the advances/reimbursements through Payroll). If you can read the information from the Infotypes during Payroll Processing, that means you could generate Information WTs (that do not affect Net or Gross) and transfer them into the Payroll Results Table, and as you know, the Remuneration Statement (PaySlip/PayStub) easily reads that information.