[petsc-users] Vector field ordering question

Dear development team, I'm trying to write a code to deal with a multi-field problem. Currently I find that the vector ordering for the field is (a1,a2,a3,b1,b2,b3), here assume a1,a2,a3 belongs to one field and bs for another field. Can I get a point-block ordering for the unknowns as (a1,b1,a2,b2,a3,b3)? I'm using DMPlex for the mesh management and first use PetscFECreateDefault to create the PetscFE object, then use this object with DMAddField to add the field to the DMPlex object. DMCreateGlobalVector is used for generating vectors. I do the discretization myself instead of using PetscFE or PetscFV. My PETSc version is 3.16.0. Do you have a case using this point-block type data structure? Best Regards, Jerry