Updating unit prices of Items from a custom list page

Hi All,

I am  in need of help on this issue.

I have a custom list page that has diferent columns like Item No.,Name, Unit cost, selling unit price, Qty, VAT, Mgt Fees, Bank Charges and so on.Based on computation, selling unit price is calculated. So, With the click of a custom function from this custom list page, the unit price of the item card is updated with the same value on the selling unit price field.This is perfectly working for a single line on the custom list page when selected.I am unable to figure out how to do the same for  multiple lines on the custom list page- cllciking the custom function and updating the unit price of all the items on thier cards.

Your help is sought.

Thanks.    

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