D,
There are no formats I know of that are set up for pounds and ounces. You
can put them in separate columns easily enough.
This formula adds them up, producing the total as a single value in pounds.
For pounds in A, ounces in B:
=SUM(A2:A11) + SUM(B2:B11)/16
These formulas separately yield the pounds and ounces parts of the total:
Total, pounds part:
=INT(SUM(A2:A11) + SUM(B2:B11)/16)
Ounces part:
=MOD(SUM(A2:A11) + SUM(B2:B11)/16 , 1) * 16
Metric is sooooo much easier than this pounds and ounces mess. I like easy!