Multiple offset along curve

i have a problem with my geometry
first of all i want to offset my curves along a specific curve (the yellow one in the picture).
then i need to use multiple offset for all of the curves along the yellow curves.
how can i do it
plus i have second question:
my question is how can i fill my lofted geometry.
is there any way to convert wireframe to solid part or subd

Command: _QuadRemesh

Hi Ali - I do not understand the first question at all - are you looking to make a variable radius pipe or tube surface along that curve?