I supported selling stages OR sell stages.... Please, which is correct?

[SunMoon]

I am not sure which one is correct:

I supported selling stages

OR

I supported sell stages

????

[Anglika]

What is the context and what are these "stages"?

[SunMoon]

Sorry, I missed the context...

I am talking my previous experience and I wanted to say that I managed and supported the phases of selling. Perhaps have to use phases instead of stages?

[Raymott]

Sorry, I missed the context...

I am talking my previous experience and I wanted to say that I managed and supported the phases of selling. Perhaps have to use phases instead of stages?

If you mean 'manage' as in farcela/ riuscire, then:
I managed well/coped well with the various stages of selling (the product).
If you mean amministrare:
I managed the various stages of selling the product. I acted as Sales Manager throughout the process.
'Support' doesn't really fit. If you are support staff, you're not a manager.