#\DeclareLyXModule{Number Figures by Section}
#\DeclareCategory{Floats & Captions}
#DescriptionBegin
#Resets the figure number at section start and prepends
#the section number to the figure number, as in 'fig. 2.1'.
#DescriptionEnd

Format 101

Requires amsmath

AddToPreamble
	\numberwithin{figure}{section}
EndPreamble

Float
	Type                  figure
	NumberWithin          section
End