When I send my tokens to the Cashaa swap address do I have to transfer the full amount?

Yes, existing ERC20 tokens are not valid anymore after the community decided to migrate from ERC20 to BEP2. Based on which wallet you are using you can find the details at our knowledge base with step by step guide on how to SWAP https://help.cashaa.com/knowledgebase-category/getting-started-guide/