The new premier tournament involving three-day games will be the only first-class event in the island.
There will be a four-day final between the top teams of respective tiers.
The new format was struck after clubs protested vehemently against a move to restrict the tournament to just 10 teams.
The new domestic structure will come in to effect from the current season with a phased out implementation of the structure.
It is aimed at bridging the gap between international cricket and domestic cricket. In the new format the Tier A/B clubs will be amalgamated with a total of 20 teams participating.
The 20 teams will be divided into two groups according to the points earned in the preceding year's tournament.
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The top teams from each group will play the final.
There will be a relegation for the three bottom teams from each group, who will play in the tournament for emerging teams, which would be also a three-day event.