Darien

really thank you all for helping
so is that I should use the free cash flow to firm, which is
EBIT x (1-Tax rate) + depreciation - Capex +/- change in working capital
to calculate the NPV, IRR and also payback period? Does that mean that the CF for NPV, IRR and Payback is also the same as the CF for valuation??
I actually have another question about valuation, my company want to acquire an overseas company X, so shall I first do a valuation on company X and use that amount as initial investment and then do a NPV to see if the project is feasible? is this approach correct ? and is that I should use a discount rate related to company X for valuation and use another discount rate related to my own comapny to calculate the NPV?