I have a blueprint that duplicates a static mesh along a spline. Is there anyway to convert the generated object to a single static mesh geometry having no blueprints attached?

Ensure the components are showing:

Select them, right click on any and convert:

You should end up with a single static mesh.

I have a blueprint that duplicates a static mesh along a spline. Is there anyway to convert the generated object to a single static mesh geometry having no blueprints attached ?

You could try RightClick → MergeActors and click MergeActors.

343503-spline3.jpg