I want create estimate and Billing

Hi bruce6,

Welcome back to the Community. I trust that business is going well on your end. I'll be happy to share more info so you can continue to manage your billing with peace of mind. 

After creating the estimate in question, QuickBooks allows you to convert that estimate into an invoice. I encourage you to reference this article as it provides more info about how to: : Convert an estimate into an invoice in QuickBooks Online. I encourage you to browse through the article and feel free to ask questions. 

I'll be one message away.