Yes, you can do that.
Besides using the include statement, you can also add the files to the
project.yml in the source section.
**However, make sure that the functions do not overlap as there is no function overloading in FunC. **
You can simply put the file in the same folder and use the
#include "imports/stdlib.fc"; command.
For more examples, please refer to the Smart Contract Examples section in the TON documentation at https://docs.ton.org/develop/smart-contracts/#smart-contract-examples.