are you trying to make validations for teams? like select team, then next drop down gives only members of that team?
you can use offset inside validation. in one cell put a validation for the list of teams. in the other cell, create a list validation, use a offset formula to return the range of members based on the selected team.
edit: not sure how to put in a table, but this is how you would fill a range with vlookup
in the table with the entries, add a column with serial number starting from 1-n
just below the drop down box, enter numbers 1 to n in order
vlookup the serial number in the table, that is the row you are looking up
for the column, use a match to look in the table which column the current selected person is
- drag the formula down to fill n numbers