Junction tables and subforms confusion

[shellig]

This has probably already been asked many different ways...but I am not sure so:
I have the following tables:
tblTask
tblOwner
tblCat
tblSubCat
with junction tables
jnctTaskCat
jnctTaskOwner
jnctCatSubCat - this one is iffy whether we need to use the same subcategory for different categories...

OK...I set up a form for the tblTask with a subform for using JnctTaskCat.
I want another subform for the subcategory...but I do not know how to do it so only the subform categories available for the chosen category show up. I have tried several ways with no luck. Perhaps it is the table I chose or I need another table? Is it the relationship that I need to define that is wrong?
This is getting confusing for a periodic Access user!
Thanks for any suggestions you can give me.

 

[Remou]

Have a look at the Northwind sample database Customer Orders form. Does it do what you want?

 

[shellig]

Those tables are one to many and these are many to many...although the subcategory does not need to be many to many, can be many to one category.
I will look more carefully but there must need to be some kind of junction table to store the subcategory value for each category for each task...confusing!!