sort variable length column for min value--number of rows is variable

Why not post a sample of your workbook as an attachment? It makes life easier all round.

Try this example workbook.

With your data in Column B as shown.
In A1

=IF(ROW()=1,1,IF(B1="TOT",ROW(),""))

Drag/Fill Down as required

In C2

=IF(B2="TOT",MIN(INDEX(B:B,MAX($A$1:$A1)):INDEX(B:B,ROW())),"")

Drag/Fill Down as required.

The helper, Column A, can be hidden, or use a grouping button as in this example.

Note the conditional formatting in Columns B & C.