Moving away and pension

"Can I transfer the money I've paid in Belgium to the pension system "

Can you precise about what exactly you are speaking.

In Belgium, pension is made of 4 pillars:
- the legal pension (paid by the ONP)
- the extra-legal pension (assurance-groupe)
- funds (épargne-pension & assurance pension)
- PLCI (for Indenpendants) or Assurance Dirigeant d'entreprise.

All those systems have different rules which are extremely complex.