Hi Prasad,
I don’t know what other words to use — it is exactly as the description says.  First decide if you want one file or multiple files.  If you want one file, choose whether you want all in one molecule or individual molecule sections,  then choose location and enter the filename.  (Most people want individual molecules, but we are giving you the choice.) If you want multiple files, choose location, but there is only one place to enter name (even though the result will have multiple names) so you have to enter something that literally includes “$name” or “$number”.

Example:
If you have two files that are models #1 and #2 in Chimera and you choose to save multiple files and enter file name: 
blahblah$number.mol2
… then you will get two files, blahblah1.mol2 and blahblah2.mol2

I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.
UCSF Chimera(X) team
Department of Pharmaceutical Chemistry
University of California, San Francisco

> On Feb 28, 2019, at 5:41 AM, prasad ssv <prasad.ssva@gmail.com> wrote:
>
> hi
> good evening
> i have sdf files,i converted all those sdf files into single mol2 files..there is a option
>       • a single file [individual @MOLECULE sections]
>       • multiple files [file name must contain $name or $number]
>       • a single file [combined @MOLECULE section] 
> may i know meaning of these option and i would like to know file name must contain $name or $number may i know how to write that.