HI,,
I solved this myself..
Below is the Solution..
<xsl:template match="Quotation_Products">
<td>
<xsl:value-of select="pid"/>
</td>
<td>
<xsl:value-of select="product_name"/>
</td>
<td>
<select>
<xsl:apply-templates select="parent::node()/parent::node()/Invoice_Customer"></xsl:apply-templates>
</select>
</td>
<td>
<a href="#myModal" data-id="{pid}" data-campid="{quoteid}" class="btn btn-primary" data-toggle="modal">Renewed</a>
</td>
</xsl:template>
<xsl:template match="Invoice_Customer">
<option value="{cus_name}">
<xsl:value-of select="cus_name"/>
</option>