Electronic shop POS system database design

Quote:

I'm creating POS system for electronic shop (phones , computers ,xbox , phones covers , phone chargers ..., etc)

I have table in database called materials:

-MID
-MaterialBarCode
-category
-MaterialName
-QuantityAvailable
-boughtPrice
-SellingPrice
-profit
-DataMa
-Ml
-Invoices_ID
Every thing is good until now, my problem is:

how can I add phones to the materials when the phones have barcode number and also have IEMI number (unique number for every phone).

In this way I can't add the IEMI number to the materials because in this way I'll need to add every single phone in one record.

what is the best way to add the same phones in the same record like :

barcode ---- category ---- MaterialName ---- quantity
1111 ----------------- phones-------------------iphone x ---------------------------5

And add the IEMI number to each phone,

Quote:

what I'm have now is another IEMI table :

-barcode
-IEMI
And every time the user inserts phones he will add the IEMI number for each phone from `datagridview``

what I have now is like this

materials table :

barcode ---- category ---- MaterialName ---- quantity
1111 phones iphone x 5
IEMI table:

barcode ---------- IEMI
1111 111111
1111 111112
1111 111113
1111 111114
1111 111115
But I think there is better way to do It. I need your suggestions ..thank you.