Hi Ward6,
Looks good. A couple of comments for future reference:
There's no need for SUM in these formulas; each is returning a single numerical value.
Numbers will automatically update cell references in formulas as you fill formulas down a column (or across a row). Rather than changing the row, you could write the formula once (for row 2), using an 'absolute start and end' reference for Row 5' (see below), then fill it down to rows 3 and 4. Numbers would update the A2 reference for each row, but leave the absolute reference to row 5 ($5:$5) as is. You can set that refeerence to 'absolute start and end' using the popup menu attached to the lozenge in which the reference is displayed in the Formula Editor and the Entry Bar. Hover the moouse over the lozenge, then click the white triangle that appears toward its right end. Choose 'absolute start and end.'
Here's what the three formulas would look like with those changes. Remember, only the formula for B2 was written. Numbers made the change in cell reference as that formula was filled into B3 and B4 by dragging the Fill Handle at the botom right corner of the selected cell (B2).
T2::B2: =OFFSET(Table 1 :: A2,0,(MATCH(TRUE,Table 1::$5:$5,0)-1))
T2::B3: =OFFSET(Table 1 :: A3,0,(MATCH(TRUE,Table 1::$5:$5,0)-1))
T2::B4: =OFFSET(Table 1 :: A4,0,(MATCH(TRUE,Table 1::$5:$5,0)-1))
Regards,
Barry