Naga,

1) Yes, it is possible. 
<fieldType name="myText" class="solr.TextField" positionIncrementGap="100">
      <analyzer type="index">
          ....
          <filter class="solr.SnowballPorterFilterFactory"
language="English" protected="protwords.txt"/> 
          ....
       </analyzer>
      <analyzer type="query">
         ... define those filters which you want to apply at query-time 
      </analyzer>
</fieldType>

2) I am not sure whether I understand your question right:
You do not need to copyField your myText-field, if it is okay for you that
the indexed data of the myText-field is stemmed and the query is not.
For example: if the original data consists of the sentence "I am working"
than it (maybe) looks like this after it is stemmed "I am work". If you
query against this with the term "working" there will be no match, if you
don't stem your querystring, too.

Hope this helps.

- Mitch
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