ict tier 2 renewal

[amor]

hi all i am currrently on ict tier 2 long term visa for three years but my cos generated for 1 year how can i extend my stay can i extend for another two years and ask my company to generate the cos for next two years ? also after two years should i go back to my country and apply for extension or can i apply for extension from uk itself ,is there any cooling ?

[4uvak]

https://www.gov.uk/tier-2-general/extend-your-visa