you can add with local.xml
code for category and product
for product detail page
<catalog_product_view translate="label">
<reference name="head">
<action method="setRobots"><value>NOINDEX,NOFOLLOW</value></action>
</reference>
</catalog_product_view>
category page
<catalog_category_layered>
<reference name="head">
<action method="setRobots"><value>NOINDEX,NOFOLLOW</value></action>
</reference>
</catalog_category_layered>
<catalog_category_default>
<reference name="head">
<action method="setRobots"><value>NOINDEX,NOFOLLOW</value></action>
</reference>
</catalog_category_default>
hope this will work for you