Show specific value in enum list based on another table related list

[G_S]

Hi 

I am having Five table 

1. Table A -----User
2. Table B---Floor
3. Table C----Group
4. Table D----Group User
5. Table E----Filter

In Group table I am having three column name 

1. Group ID
2. Floor-Ref of floor table 
3. Related Group User

In Group User Table I have three column

1. Id
2. Users-Ref to user table where email id is a key

In Filter table I am having column name Floor -Ref of Table B(floor)

What I need is I need to show the specific floor to only to the user in the related group user

Can anyone suggest expression to show only specific floor for user in specific group