just run Bitmap Style Designer from your current IDE,

open the template and save it as FM style (*.style) with an appropriate name.

Then you can use *.style files in a TStyleBook component.

For more information please read the documentation:

http://docwiki.embarcadero.com/Libraries/Tokyo/en/FMX.Controls.TStyleBook

http://docwiki.embarcadero.com/RADStudio/Tokyo/en/Customizing_FireMonkey_Applications_with_Styles

Only for V.I.P