How to migrate existing Shopify Store to new Theme 2.0 without impacting the sale or business

[YellowVerandah]

We want to migrate from existing Shopify Store to new Theme 2.0 without impacting the sale or business. It's a mega catalogue store with 6000+ SKUs, hence we cannot do any change to existing store which will impact sale or AD performance.

We want to develop new store (with Theme 2.0), migrate all data from existing store to new store and then make the new store LIVE !! 

Please help how to do this migration in detail.

[PaulNewton]

Docs for developers to migrate a theme to begin being OS2.0 compatible

https://shopify.dev/themes/os20/migration

Please help how to do this migration in detail.

You need to be much more specific with such questions.

Theme migration can be a very involved process with many aspects , steps and details specific to each case that go way beyond a single general forum discussion.

Then a store migration is yet another complexity ontop of that you should handle each process and it's questions individually, plenty of forum posts on the topic of store migration or store sync.

If you are unsure of the process even at a general level then check the shopify experts directory for migration services and consulting to go over your situation with an expert.