How do I join and link three tables?

-so that each invoice for the customer contains the ability to add 10 materials linked to the materials table.

-Then in the invoice table, the prices of the materials are collected in the total field at the end of the invoice.

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Thank you “Mr. Vladimir_PV”
For your valuable time that you gave me and your fruitful effort, I will follow the explanation of the video and report back to you with the result

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