https://www.lowendtalk.com/discussion/155540/1-gb-ram-10-gb-nvme-1-tb-bandwidth-2-5-mo-la-ny-oslo-vienna/p1 Yes, you can combine multiple storage plans.
https://www.lowendtalk.com/discussion/130301/hosthatch-bf-2017-good-deals/p2 Yep, combining them is no problem.