Show all records

I have a form that has drop lists.
Users will use a list to choose an item, then the associated query will
filter by that item.

Two things:

1) How do I get the list to make the query show all records. The list is
made up of records from another query.

2) How do I do number 1) when one form uses two lists called TimeStart and
TimeEnd to tell the query to filter records between two dates. How do I make
the date version show all records as well.


Speaking on 1), currently when the form comes up, it has no records because
the query hasn't received anything from the users to filter by. Once they
choose something from the drop-down lists, the the query will refresh and
show the filter records. How do I get it to show all the records.