  This paper describes additional aspects of a digital tool called the 'Textual
History Tool'. We describe its various salient features with special reference
to those of its features that may help the philologist digitize commentaries
and sub-commentaries on a text. This tool captures the historical evolution of
a text through various temporal stages, and interrelated data culled from
various types of related texts. We use the text of the K\=a\'sik\=avrtti (KV)
as a sample text, and with the help of philologists, we digitize the
commentaries available to us. We digitize the Ny\=asa (Ny), the Padama\~njar\=i
(Pm) and sub commentaries on the KV text known as the Tantraprad\=ipa (Tp), and
the Makaranda (Mk). We divide each commentary and sub-commentary into
functional units and describe the methodology and motivation behind the
functional unit division. Our functional unit division helps generate more
accurate phylogenetic trees for the text, based on distance methods using the
data entered in the tool.
