Google sheets lookup and sum

Question

I have a production schedule where cells are filled with text:

Day 1, Day 2 etc.

And I'd like these cells to be associated with values elsewhere in the same sheet.

For example. Day 1 would be 4 (which corresponds to 4 hours).

Then I have to sum these cells/values (Day 1 = 4 + Day 2 = 6) to get a total for each row.

I can't seem to find a way to do all this using one formula. Is it even possible?

Feel free to check out the sheet.

Answer 1

=SUMPRODUCT(IFERROR(VLOOKUP(B2:L2,Formulas!A:B,2,0)))