How to create a txt file, load it, modify it and then save it again?

Hello everyone!
I have a question and I hope you'll help me.
I'd like to create a txt file (please see attached pdf file) but I don't know how. I've tried many methods but it's not working 
The user should be able to change the parameters (for example "Time", "Time Type" ...etc) and the corresponding values from the Front Panel.
The number of section (Begin Line......End Line)  is 128.  Means, the final file should contain  "Begin Line1....End Line1"   till  "Begin Line128....End Line128".
Please, take a look at the attached file to see how does the structure of the file look like.
Note:  the seperator between a parameter (example, "Time") and its value (example, "7" in the section "Begin Line1....End Line1") is a colon( " : " ) and not an equal (" = ").
Thank you very much for your help.
Best regards
Attachments:
Batch File.pdf ‏8 KB

Hi
thanks for your answers.
I'm using LV 8.2  and my file should be saved in txt.
Initially the file doesn't exist. So, the user choose the parameters and their values from the Front Panel
and then hit a button to create that file. The user should be able to reload (Front Panel button) the created file, modify it or not and then resave it.
Before hitting the "create file" button the user define (on the Front Panel)  the number of sections ("Begin Line.....End Line") to be created.
I joined a VI here just to explain the idea. May be that can help you to help me.
I appreciate yoyur help!
Kabanga
Attachments:
Create batch file.vi ‏14 KB

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