Ym mis Mawrth 2021 gwnaed rheoliadau i sefydlu pedwar Cyd-bwyllgor Corfforedig yng Nghymru. Yn ogystal â darparu ar gyfer sefydlu’r Cyd-bwyllgorau Corfforedig, mae'r Rheoliadau Sefydlu yn cynnwys y trefniadau cyfansoddiadol craidd a manylion allweddol fel aelodaeth a'r swyddogaethau a gaiff eu harfer gan bob Cyd-bwyllgor Corfforedig: cynllunio datblygiad strategol; cynllunio trafnidiaeth ranbarthol; a'r pŵer i wneud pethau i hybu neu i wella llesiant economaidd eu hardaloedd. Roedd nifer o offerynnau eraill yn cyd-fynd â'r Rheoliadau Sefydlu gan sicrhau bod Cyd-bwyllgorau Corfforedig (a'u haelodau) yn destun gofynion goruchwylio, rheoli ac ymddygiad priodol o'r cychwyn cyntaf.
In March 2021 regulations were made to establish four CJCs in Wales. As well as providing for the establishment of each of the CJCs, the Establishment Regulations included the core constitutional arrangements and key details such as membership and the functions which will be exercised by each CJC: strategic development planning; regional transport planning; and the power to do things to promote or improve the economic well-being of their areas. The Establishment Regulations were accompanied by a number of other instruments which ensured that CJCs (and their members) were subject to appropriate oversight, management and conduct requirements from the start.