PL/SQL :: Insert Values Into A Nested Table Or Array With A Loop

How to create this pl/sql process to add elements to a nested table or varray within a loop. Here's the scenario: I have an apex package that has some pl/sql processes and some stored procedures. I am dealing with Inspection Areas. An Inspection Area has several sectors. I already have the loop that lists all the Inspection Areas and a loop inside that loop that lists all the sectors. There is an if statement that determines whether or not the sector name gets stored in the varray or table. I am not sure how to correctly do this and am not sure whether to use a nested table or varray. I've posted somewhat of a pseudo coded example below  

If  (you_belong_in_table)  then
variable := store_me_in_varray      /* OR */
variable := array_type(sector.sector_name)
i := i + 1;
end if;

/* Now we output our varray or table */
start loop
output(sector names one by one)

end loop I hope this makes sense. I more so just need the syntax to be able to continually added values to a table or varray while I'm already inside a loop; and also how to output those values end the end as well.