Introduction
This achievable with a combination of Permissions and View Access Levels.
In this example we have used 3 members called MemberA, MemberB and MemberC with a 'supervisor' called MonitorABC. That is A, B and C denote which member. Maybe Supervisor might be a better name.
Once the basic structures are set up then it is straightforward to add additional members.
Basic Setup
1. User Groups
2. View Access Levels
3. Users
4. Categories
5. Menu Items
User Groups
In this example they are called ,memberA-UG', 'memberB-UG' and 'memberC-UG'. Also create a User Group for the Supervisor which is called here as 'monitorABC-UG'. The first step is to create a User Group for each member, even if we have not yet added the member as a user of the site. This is done in the Joomla! Users section.
And then use the In all cases the parent User Group is Registered.

View Access Levels
Create the access levels,which are called here memberAview, memberBview and memberCview. And assign the appropriate User Groups. Also create a view for the Monitor, which is called monitorView in this example.
To create te access level go to
Next select the
The Access levels each have their 'member UG' and also monitorView as illustrated opposite.
.
.



User Groups Settings
Next look at tabs Note that the 'monitorABC-UG' has a higher Ranking. This is because the 'monitor' user will belong to all the user groups. The User Group settings for the Monitor are generaly more extensive.

Users
It is simpler to do this at this juncture as we have already created the user group to which the user will be assigned and so avoids having to go back to the User Management.
In the main Joomla panel click on
. Then at top click on 
Categories
As noted later it is these top level categories where we will setup the permissions.
Then create appropriate subcategories, which includes the members name or similar 'ID' for various 'topics' and 'reports'.
Note the setting of the view Access Levels.

Permissions
At this stage we need to decide which permission to give each member and those for the 'monitor' user Group. So click on the name of say MemberAcat. This opens up the category . Click on the
We only need to set the permission in the Top level Categories as they will cascade down to the the sub categoies and then to the Downloads.

We also need to set the Permisions for the 'monitor' in each top level category.

Menu Items
They must be set set with the relevant view access level.
Also there could be a List My Downloads menu item that has a Registered view access level.
For this menu item to work then every Download needs to have the 'creator' set as noted below.

Download creator
If it is the relevant member who is creating the Download then jDownloads automatically sets this option appropriately.
Examples
The List My Downloads view shown is dependant on who is logged in.
View shown opposite is when MemberA is logged in.

This is the view when using the menu item 'memberAcategory' is used.

