Urgent: Group by category in a chart

Hello,
I am working on an app that has companies and codes. Codes are then grouped into categories. The computer and code data is provided in a spreadsheet. Companies have a list of these codes.
I am importing this data via CSV file upload. I need help in associating Category to the company. As I am trying to show company data in bar chart grouped by category.

Can someone help me with this?

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