flexible XIRR with different starting dates

Hello all, I am looking for a flexible IRR that looks up dates and cash flows when each cash flow (one set of cash flows per line with dates all located on the top line.
If I use simple IRR I cannot copy it down as then there are zero cash flows before the first negative cash flow so I need a flexible IRR that can basically either look up a start date and then XIRR all cash flows or a flexible IRR that will ignore the zeros and start at the first negative cash flow. My excel looks like this below. Any responses appreciated!

excel.JPG