hot to convert txt to csv

I have work documents that are in txt format that I need to send in cvs format, how do I convert them in neat office?

This site is for questions and answers about LibreOffice usage. For neat office (whatever it is), go to a respective site.

.txt isn’t a “format”. A file with this extension simply should be “plain text”: No formatting at all. The only thing probably reminding of a “format” should be the line feed. However, that can be LF, CR or CRLF (two control characters) depending on the OS standard.
.csv also is plain text, only with the connotation that the lines are intended to reperesent a data set each.
If a collection of data is exported to a .csv file, one of the characters is used as “field separator”, another one as “text delimiter” e.g.
If such a collection shall be read in such settings need to be specified again, and if file content and settings match semantically things will work.

Conversion between .txt and .csv neither needed nor possible.
If you want a .txt to be accepted as a .csv by Calc, e.g. simply append a .csv to the name of the file to make things easy.