How to link ACCOUNTS with PRODUCTS?

How to link ACCOUNTS with PRODUCTS?

I have created 8 PRODUCTS and imported all the ACCOUNTS. 
Now I want to link Accounts with Products with Many to Many relationship.

One Account may be linked to more than one product.

How do I achieve this?

Zoho help support is pathetic and I have already wasted more than three hours.

Would appreciate your help in this regard.

I have created a file containing Account ID and Product Id.

Multiple Product Id are mentioned against some of the ACCOUNTS with a semicolon (;) separator.

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