You can add a SODIMM, but you can't remove soldered RAM.

Probably, assuming your laptop’s SODIMM slot supports a 16GB module and the total 32GB is within the system’s maximum. The soldered 16GB stays put; you’re just adding another stick to hit the full 32GB.

Most laptops that combine soldered and slot RAM allow that configuration—16GB fixed plus 16GB in the slot equals 32GB. But some cheap or older models cap the SODIMM at 8GB, or the BIOS has a weird limit. Check your exact model’s specs before buying.

If you don’t have a free slot (e.g., already occupied), you’re stuck unless you can replace the existing SODIMM with a larger one and keep the soldered portion. That works too—just swap the module for a 16GB or 32GB stick, depending on what the slot supports and the total limit