How to sum prices that are in separate rows

Hello,
I’m not an expert spreadsheet user, nor a software developer. Just trying to develop a simple app to keep track of my business.
I have different jobs listed in a given slice, row by row, each row (or job in my case) contains price information as well.
Like:

  • (JobNameA) - Client A - 500$
    *(JobNameB) - Client B - 647$
    *(JobNameC) - Client A - 1200$ etc.
    Now I need help to sum these prices on the app when necessary. For example, I’ll send an invoice to Client A, and I need to see on the app how much they owe me in total by selecting multiple rows or filtering them.
    How can I do this? Hope I could explain the situation
    Thanks in advance
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