Given the form 

<FORM action="http://www.example.com/survey.cgi" method="POST">
   <SELECT multiple name="select1">
      <OPTION selected value="Component_1_1">Component_1</OPTION>
      <OPTION selected value="Component_1_2">Component_2</OPTION>
      <OPTION          value="Component_1_3">Component_3</OPTION>
      <OPTION          value="Component_1_4">Component_4</OPTION>
   </SELECT>

   <SELECT multiple name="select2">
      <OPTION          value="Component_2_1">Component_1</OPTION>
      <OPTION          value="Component_2_2">Component_2</OPTION>
      <OPTION selected value="Component_2_3">Component_3</OPTION>
      <OPTION          value="Component_2_4">Component_4</OPTION>
   </SELECT>

   <INPUT type="submit" value="Send"><INPUT type="reset">
</FORM>

[download]

the following would create a request using the initial values, 

POST 'http://www.example.com/survey.cgi',
     [ select1 => 'Component_1_1',
       select1 => 'Component_1_2',
       select2 => 'Component_2_3',
     ];

[download]

It's easy to see what you should provide by changing the POST to GET and submitting the form to a non existant URL using your web browser: (spacing added for readability) 

http://www.example.com/nonexistant.cgi
   ? select1=Component_1_1
   & select1=Component_1_2
   & select2=Component_2_3

[download]

Update: It might be easier for you to build the request as follows: 

POST 'http://www.example.com/survey.cgi',
     [ ( map {; select1 => $_ } @select1_values ),
       ( map {; select2 => $_ } @select2_values ),
     ];

[download]

In reply to Re: how to post multiple select list through LWP::agent by ikegami
in thread how to post multiple select list through LWP::agent by NPhard

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