I'd like to know if the following is possible. When an Opportunity reaches sales stage 3, I would like a Screen Flow to launch(which will create a Quote).
Reason : To create more guidance/fluency for users and reduce clicks. Today the users have to click an Action.
Best Answer
Yes, you can add a Screen Flow component to the relevant Opportunity Lightning Page(s) and make the component conditionally rendered by using the "Set Component Visibility" option on the Lightning Page from App Builder.
See below:
If you wanted to spice things up and make the option/prompt to create a quote more obvious by having it pop up in a modal, you could try wrapping the Flow in a Lightning component that renders conditionally on the page with this free Salesforce Labs AppExchange component.