Probably this is what You looking for:
.number: &AnchorDelay
optimistic: true
min_value: 0
max_value: 600
step: 1
initial_value: 0
web_server: &AnchorDelayWebServer
sorting_group_id: sorting_group_switchmain
sorting_weight: 30
number:
- platform: template
<<: *AnchorDelay
id: "SwitchMainDelay"
name: "Main Switch Delay"
- platform: template
<<: *AnchorDelay
id: "Switch01Delay"
name: "Switch 01 Delay"
web_server:
<< : *AnchorDelayWebServer
sorting_group_id: sorting_group_switch1
- platform: template
<<: *AnchorDelay
id: "Switch02Delay"
name: "Switch 2 Delay"
web_server:
<< : *AnchorDelayWebServer
sorting_group_id: sorting_group_switch2