Best Practice for setting up Organisation unit groups and sets

What should be the best way to set up Org Unit group and set for the following way i have setup
Level 1: My Organisation
Level 2: My Country
Level 3: My States
Level 4: My Districts
Level 5. Villages/Towns
Level 6. Hamlets/Local Area
Level 7. Facilities/Houses

Can any body suggest how should i setup Organization unit groups, Organization unit sets and Organisational unit level. Also how to enter polygons for Country to Hamlets.

Please note my DHIS2 version is 2.37 on JDK 11 and postgres is 14.1

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