To map additional subformat names to existing subformat definitions (for example):
[FormatAliases] ; subformat name = another subformat name DividerBorder = ThickBorder
You can use this section to specify properties for the subformat named on the left as though [FirstSubformat]based=SecondSubformat (see §7.4.3 Basing format properties on other formats). Make sure that SecondSubformat is defined somewhere in the subformat template chain.
When DITA2Go looks up subformat definitions, DITA2Go replaces each subformat name listed on the left with the name assigned to it on the right. This process is not recursive; if you assign subformat names a=b and b=c, when DITA2Go needs a definition for a, instead DITA2Go looks for a definition of b, not c.