If you need more control on what to save, for example to save only a range, you should use the SaveRangeAsTextDelim global method (on unit UTextDelim). 

When saving a string that contains the delimiter, it will automatically quote the string, by adding the character " at the beginning and at the end of it. If the string contains a Quote character (") , it will be doubled.

To save a CSV file (Comma Separated Values):

SaveAsText('Filename', ',' );

To save a CSV file (Comma Separated Values) using ";" instead of "," to separate the fields:

//This is the way CSV is saved on countries where the "," and not the "." is the decimal separator.
SaveAsText('Filename', ';' );

To save a Tab Delimited file:

SaveAsText('Filename', #9 );

TFlexCelImport Methods