Form multiple parent node for each of its descendants - xslt-1.0

Question

Im quite new to xslt and breaking my head over this issue. Can anyone please help me with this?
Please find the input XML, I need to look for text L1 in id field of L node and search sublocation id and pit ref has text L1 and form new L1 node and arrange sublocation and pit under each L1 nodes.
<root>
<L Id="L1">
<test>ed</test>
<SubLocation id="L1S1">
<check>
<AId>1</AId>
</check>
<MD>
<UnitNumber>1</UnitNumber>
</MD>
</SubLocation>
<SubLocation id="L1S2">
<check>
<AId>2</AId>
</check>
<MD>
<UnitNumber>2</UnitNumber>
</MD>
</SubLocation>
</L>
<L Id="L2">
<test>ed</test>
<SubLocation id="L2S1">
<check>
<AId>1</AId>
</check>
<MD>
<UnitNumber>1</UnitNumber>
</MD>
</SubLocation>
<SubLocation id="L2S2">
<check>
<AId>2</AId>
</check>
<MD>
<UnitNumber>2</UnitNumber>
</MD>
</SubLocation>
</L>
<cp>
<current>
<Amt>20154.00</Amt>
</current>
<pi>
<pit ref="L1S1">
<value>1232</value>
</pit>
<pit ref="L1S2">
<value>12345</value>
</pit>
<pit ref="L1S3">
<value>12387</value>
</pit>
<pit ref="L2S1">
<value>1232</value>
</pit>
<pit ref="L2S2">
<value>12345</value>
</pit>
</pi>
</cp>
</root>
I need the o/p in following format
<root>
<L1>
<SubLocation id="L1S1">
<check>
<AId>1</AId>
</check>
<MD>
<UnitNumber>1</UnitNumber>
</MD>
</SubLocation>
<pit ref="L1S1">
<value>1232</value>
</pit>
</L1>
<L1>
<SubLocation id="L1S2">
<check>
<AId>2</AId>
</check>
<MD>
<UnitNumber>2</UnitNumber>
</MD>
</SubLocation>
<pit ref="L1S2">
<value>12345</value>
</pit>
</L1>
<L2>
<SubLocation id="L2S1">
<check>
<AId>1</AId>
</check>
<MD>
<UnitNumber>1</UnitNumber>
</MD>
</SubLocation>
<pit ref="L2S1">
<value>1232</value>
</pit>
</L2>
<L2>
<SubLocation id="L2S2">
<check>
<AId>2</AId>
</check>
<MD>
<UnitNumber>2</UnitNumber>
</MD>
</SubLocation>
<pit ref="L2S2">
<value>12345</value>
</pit>
</L2>
</root>
This is my xslt
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="cpbyid" match="pit" use="#ref"/>
<xsl:key name="slById" match="SubLocation" use="#id"/>
<xsl:key name="locbyId" match="L" use="#id"/>
<xsl:template match="#*|node()" name="identity">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="L/*[#id]">
<L>
<xsl:value-of select="//L/#id"/>
<pifo>
<xsl:call-template name="subloc"></xsl:call-template>
<xsl:call-template name="identity"/>
</pifo>
</L>
</xsl:template>
<xsl:template match="pit/*[#ref]" name="subloc">
<inf>
<xsl:copy-of select="key('cpbyid', #id)"/>
<xsl:copy-of select="key('slById', #id)"/>
</inf>
</xsl:template>
</xsl:stylesheet>

Answer 1

I don't follow your description that well and I may be missing something. Is there a reason why you cannot do simply:
XSLT 1.0
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<xsl:key name="pit" match="pit" use="#ref" />
<xsl:template match="/root">
<xsl:copy>
<xsl:for-each select="L/SubLocation">
<xsl:element name="{../#Id}">
<xsl:copy-of select="."/>
<xsl:copy-of select="key('pit', #id)"/>
</xsl:element>
</xsl:for-each>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>