احسن الله إليكم traveling with a group and we want to combine our prayers, do we pray 2 rak’ah for dhuhr as well as asr if we combine? And can we combine it in congregation? جزاكم الله خيرا

While travelling (i.e., in the journey itself not after you have reached your destination) yes u can combine and u pray jama'ah as u r a grp, but if u pray behind someone who is not a traveller then u pray 4 rakas behind him.