Three options:
1 - convert from another program https://proconnect.intuit.com/support/en-us/help-article/convert-files/convert-tax-return-data-proco...
2 - Import client data from ... https://proconnect.intuit.com/support/en-us/help-search?filter=ProConnect%20Tax%20Online&q=Import%20...
3 - Import Clients from qb https://proconnect.intuit.com/support/en-us/help-article/import-export-data-files/prepare-export-cli...
In the future, use all the space provided you to give as much detail as you can about your question.
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