Owen

[mighty moat]

Please be patient

Our volunteers look into many questions every day; sometimes it takes them a little while to answer.

Pro tip: you can rename the thread title with `.tr <thread name>`

Make it descriptive, including relevant context, but also to the point. This way you improve your chances of getting a more relevant and specific answer.

[valid escarp]

It's an indefinite plural article, with the noun after it implied.

Un rêve comme ça = a dream like this
Un comme ça = One like this

Des rêves comme ça = Dreams like this
Des comme ça = ones like this

Phrasing it like this is chiefly informal: normally it's done before adjectives, and here "comme ça" isn't one but it's being treated as one regardless.

[amber berry]

could u give me some examples with this structure

when u say its done before adjectives

an example of this would be appreciated

like j'en ai une belle?

or j'en ai des belles

is this what u mean?

[novel atlas]

Yep.
En voir de belles, en faire de belles, en entendre de belles, en dire de belles are other examples.