LTC exemption in ITR confusion ?

I am central government employee (GP 4800) and we can avail LTC (Leave travel concession) and claim LTC journey amount but LTC journey amount is neither included in our salary. We have to first bear our own expenses and buy train/air tickets.

So my question is

1) whether we (central/state government employee) can fill ltc claim amount in "less: exempt allowance => section 10(5)-leave travel concession" option while filing itr ?

2) I think section 10(5) is for those PSU or private company employees whose salary is made in something like CTC format and their LTC/LTA amount is already mentioned in CTC. Am i right ?

Note: no any Earned Leave encash by me