SUMIFS based on two criteria, dependant on result of IFERROR formula

Hi there

I have a workbook with two sheets. Sheet 1 contains data - Sheet 2 is summarising the findings of the data.

I've got an IFERROR formula in Sheet 2, column B, row 3 onward that's picking up sub-contractors based on two criteria from sheet 1 - this is working fine.

What I now want to do is calculate the total contract value in Sheet 1, column F for the sub-contractor named in Sheet 2, column B that's been added based on the above. This needs to include the same criteria as I will be adding further locations to Sheet 1 and whilst the sub-contractor's will vary they may also be listed in Sheet 1 for more than 1 location.

Any suggestions on how I can do this will be most welcome. I've highlighted in yellow on the second sheet the columns where I intend to add the formulas, B is already done. The contract value needs to populate in Sheet 2, column C - next to the contractor in column B that's been named as a result of the IFERROR formula.

Thanks!