As Dennis mentioned, even I didn't get the question. If you want to add a string into an array, either use a ' Build Array' function from the function palette or if you have an initialized array of strings present, use an 'Insert Into Array' function from the function palette. If you are looking for a way to take out a string from an array, use the 'Index Array' function from the function palette. Also, if you are dealing with loops (FOR, While. etc) you may need to know about 'Shift Registers' as well.
Good examples of all these functions are present in the LabVIEW examples finder where you can search for these function examples. I would suggest you go through those examples before posting questions directly on the forum.
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What is the data format. Comma delimited string of ASCII numbers? Please provide an example to clearly show what you currently have and what it is that you want.