Multiple "et al" citations with same first author but different co-authors -- how to combine them

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I assume the result is not Smith et al. (2000a,b) because the “et al” authors are different in each reference.

 

 

UPDATED EDITED RESPONSE

Yes, the two references must have the same authors in orfer to achieve the desired Smith et al. (2000a,b) format.  but you can achieve Smith et al. (2000a,b) by deselecting the “Add more authors until the citation is unique” option - refer to the screenshot in my prior posting.