Excel: select value from multiple id's -

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so, want find id's (there multiple) in column orderid. formula have...

=lookup(indirect("a" & row()),table2[orderid],table2[quantity])

it selects value of last id of said number, how write select them , add them together?

i think you're looking sumif:

=sumif(table2[orderid],a1,table2[quantity])

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