Hello,
If you want to re-use spt kernel project, after importing project . it is necessary to add SPT algo declare/ extern object in the header file-"SPT_kernels\api\rsdk_spt_kernels_s32r45.h" manually, the algorithm code will be built into the SPT static lib file"*.aspt"
you can find some help document in S32DS in case you need, like "how to create new/build spt project, linking spt lib", see attached picture.

Best Regards,
Peter