I did it

Q1 was to ask about rating of services of services and Q2 was to rate ans suggest improvement in services used earlier. Array filtering was not working for me as I wanted to use subquestion about service with higher level of satisfaction. I had zero sense of Jquery and Jscript but worked with scratch while working with my 8 yr old

script type='text/javascript'>
$(document).ready(function() {

//Making id's based on subQuestion from previos question
var subCodes = new Array(6);
for (i=0;i < subCodes.length;i++)
subCodes="#java58771X85X1931S"+(i+1);//Q1's codes

//getting values from id and storing index
var indexValue = [ ];

for (i=0;i < subCodes.length;i++){
var valueStored= $(subCodes).val();
if ( (valueStored == "A1") || (valueStored == "A2") )
indexValue.push(subCodes.substr(-2)); //code is S1 thus -2
}

for (i=0;i < indexValue.length;i++){
//$("li#"+"javatbd{SGQ}"+indexValue).remove(); //removed never worked as it gives issues in mandatory
$("li#"+"javatbd{SGQ}"+indexValue).hide();
$("#answer{SGQ}"+indexValue).val("REMOVED");
}
});
</script>

This script is an effort after learning from www.22surveys.com/ and that of www.aptigence.com.au/home/archive website and google

Now issues that I faced was that when I declared Q2 as mandatory then I was messed about by code that checks
unfilled fields.

Psating the code for other, if u can, just wanted to share

Wishes,

Limeed for Life
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[attachment:1]limesurvey_survey_58771.lss[/attachment]
Sleeping near riven trent, UK