Hi Vika,
I suggest to use file functions…
Did you do any of those free online LabVIEW courses for beginners offered by NI?
Did you even started the ExampleFinder in LabVIEW's help menu?
All your questions (so far) indicate missing knowledge of and practicing in using LabVIEW. Do yourself a favor and take some courses before starting to code…
And please learn to give better thread titles in the first place!