It is easy in Corel.
I looked at Inkscape and I think the options below will do the same thing.
edit: Un-group all.
Select Edit Paths (F2)
Touch one of the nodes in the top (flame?) path sequence. I chose the lower node.
It should show a path switch in the graphic.
When saved (I think) it will be the same as reverse subpath for Corel.
If not I can explore some more, but this looks like the Inkscape method.
This is useful when you have a letter like B (with some fonts or other graphics you wish to not engrave) that will not show a hallow inside the B. Reverse the subpaths on the inside nodes and good to go.