Yes, Aelijah. You can handle multiple independent contractor roles or gigs and attach your income and delivery earnings to one email. Let me provide more details on how you can accomplish this.
QuickBooks Self-Employed (QBSE) allows you to track multiple sources of income and categorize them accordingly within one account. However, the QBSE platform treats all income sources as belonging to a single self-employed individual. It does not differentiate multiple businesses or gigs under separate profiles or email addresses within the same account.
This means you can manage both 1099 gigs (original job and delivery work) in one QBSE account under the same email, but they will all be part of a single combined financial view. You can use tags or categorization to separate the transactions related to each gig. Furthermore, you can use the Notes feature to specify to which gig each transaction relates.

Furthermore, you can check out this article to learn how to file taxes in QuickBooks Self-Employed: QuickBooks Self-Employed annual tax guide.
With these, you can maintain precise records and streamline your financial tracking in QBSE. If you need more tips on optimizing your use of QBSE or have any specific queries, feel free to reach out.