"""""""I have a need to apply some organic type engraving onto sphere , I can use flow to place the curves onto a sphere, but I can't solidify the curves so I can't Boolean diff from the sphere. To create the engraving"""""""

Did you know flow works with surfaces and solids too? You could make your curves extrude "FIRST" then use a plane and the sphere to flow solids onto the sphere, then boolean diff those.