Pasted

choice area from a list(kitchen,salon,room) display on a sub-list the appropriate timer(kitchen timer1, kitchen timer2, kitchen timer3, salon timer1, salon timer2, etc..)
display the select timer card on the bottom.
 
type: 'custom:vertical-stack-in-card'
title: Timers
cards:
  - type: entities
    entities:
      - input_select.living_room_preset
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Kitchen
    card:
      type: entities
      entities:
        - input_select.kitchen_timers_preset
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Salon
    card:
      type: entities
      entities:
        - input_select.salon_timers_preset
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Dining Room
    card:
      type: entities
      entities:
        - input_select.dining_room_timers_preset
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Kitchen
      - entity: input_select.kitchen_timers_preset
        state: Kitchen Timer1
    card:
      title: Timer Kitchen 1
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.kitchen1_timer
          name: Timer ON/OFF
        - entity: input_datetime.kitchen1_timer_start
        - entity: input_datetime.kitchen1_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Kitchen
      - entity: input_select.kitchen_timers_preset
        state: Kitchen Timer2
    card:
      title: Timer Kitchen 2
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.kitchen2_timer
          name: Timer ON/OFF
        - entity: input_datetime.kitchen2_timer_start
        - entity: input_datetime.kitchen2_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Kitchen
      - entity: input_select.kitchen_timers_preset
        state: Kitchen Timer3
    card:
      title: Timer Kitchen 3
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.kitchen3_timer
          name: Timer ON/OFF
        - entity: input_datetime.kitchen3_timer_start
        - entity: input_datetime.kitchen3_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Salon
      - entity: input_select.salon_timers_preset
        state: Salon Timer1
    card:
      title: Timer Salon 1
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.salon1_timer
          name: Timer ON/OFF
        - entity: input_datetime.salon1_timer_start
        - entity: input_datetime.salon1_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Salon
      - entity: input_select.salon_timers_preset
        state: Salon Timer2
    card:
      title: Timer Salon 2
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.salon2_timer
          name: Timer ON/OFF
        - entity: input_datetime.salon2_timer_start
        - entity: input_datetime.salon2_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Salon
      - entity: input_select.salon_timers_preset
        state: Salon Timer3
    card:
      title: Timer Salon 3
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.salon3_timer
          name: Timer ON/OFF
        - entity: input_datetime.salon3_timer_start
        - entity: input_datetime.salon3_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Dining Room
      - entity: input_select.dining_room_timers_preset
        state: Dining Room Timer1
    card:
      title: Dining Room Timer 1
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.dining1_room
          name: Timer ON/OFF
        - entity: input_datetime.dining_room1_timer_start
        - entity: input_datetime.dining_room1_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Dining Room
      - entity: input_select.dining_room_timers_preset
        state: Dining Room Timer2
    card:
      title: Dining Room Timer 2
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.dining2_room
          name: Timer ON/OFF
        - entity: input_datetime.dining_room2_timer_start
        - entity: input_datetime.dining_room2_timer_end
  - type: conditional
    conditions:
      - entity: input_select.living_room_preset
        state: Dining Room
      - entity: input_select.dining_room_timers_preset
        state: Dining Room Timer3
    card:
      title: Dining Room Timer 3
      show_header_toggle: false
      type: entities
      entities:
        - entity: input_boolean.dining3_room
          name: Timer ON/OFF
        - entity: input_datetime.dining_room3_timer_start
        - entity: input_datetime.dining_room3_timer_end