I know how to pick from a lookup table to insert information into a column.  
Based on the selection in the first column, I would like to have different
lists available for a second column.  For example, column A would have a
lookup table with "flow switch" and "level switch" as the available picks.  
When filling out Column B, if "flow switch" is picked for column A, a lookup
table with "target type" and "pressure type" would be available.  But if
"level switch" is picked for column A, "float type" and "conductivity type"
would be available.  Thanks.