if u want to work in "B" company lawfully, it is better to get "Egar" means temporary visa transfer. if u complete one year then collect a form from immigration to get it released for 6 months. This form to be signed by both company's authorised signatory and submit to immigration along with your passport. Then they will stamp a new Rp in your passport under "B" company name for 6 months period. While getting expired that date, you can apply again. This time you can apply original RP transfer. Meanwhile, if u found the "B" company not good u can transfer to any "C" company your RP. I hope u clean now. Best of Luck