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Thank you for reaching out to us here on the Community page, @naturf.
You can create invoices in QuickBooks Online from the Plus (+) icon.
On the other hand, we aren't able to create statement charges in QuickBooks Online (QBO) unlike QuickBooks Desktop (QBDT). However, if you wish to create and send customer statements in QBO, read this article for your reference: Create and view customer statements.
Reach out to me if you have any other questions. I'm a post away to help. Happy weekend!