Thanks for posting. With Geekbench 4 Pro, you can specify how many threads you would like the benchmark to run on with the --cpu-workers and memory-workers commands. However, there is no option to bind those threads to a specific core.
I hope this answers your question. If not, let me know if there's anything I can help clarify.
When you unlock Geekbench 4 with a Geekbench 4 Pro license, you have to option to install the Command Line tool. There are four commands available to configure the CPU benchmark: --cpu-workers and --memory-workers are two of those.