W-4 calculator questions

If I am trying to use the Turbotax W-4 calculator and switched jobs earlier this year, I am unsure of how to use the tool correctly. How can we take into account jobs held only a small portion of the year that might have included vacation payouts, etc especially if the final paystub doesn't reflect the normal earnings? Is it OK to just use year to date gross salary and taxes?  It looks like putting in multiple jobs asks for both "per pay period" and "total" pay and taxes.