The Vitis subsystem flow tutorial starts by adding AIE, HLS and RTL blocks to a Vitis Subsystem, then uses Vitis export to Vivado flow to put the VSS into a full design context. In addition the tutorial adds more HLS example blocks to the extensible platform using Vitis linking and then exports the contribution, including VSS and AIE to a VMA which Vivado can import.
All the steps from creating a Vivado extensible platform onwards can be resued given that the blocks from the VSS are moved into the vitis/ip folder and the linker configuration script is updated according to the new locations.