Feature across multiple Phases

I am newbie here and am not sure if my issue already has a known solution - would be grateful if somebody could point me to that...

What am I looking for?

I have a feature which has two different phases - design and development. The start & end dates given in the feature card - do they relate only to one specific phase of the feature or the entirety?

Second, if I have a release with different phases - and the feature has to go through these different phases, can I add it at both the places? Example - if the Release has a design and development phases, can I add the feature to the design phase of the Release when the feature is also in design phase with its relevant start/end dates and also once again to the development phases with that set of start/end dates.

I hope I have made myself clear - I am sorry to be using this forum as a doubt resolution space.