Transferring from category 3 visa

Hi friends,

I'm currently working in malaysia and i planning to join a new company.i have few concerns which i don't know and it would be greaf if someone can help me.
1.i'm transferring from category 3 to category 3 visa what are the documents i need to give to the new company.i'm the first one they are recruting abroad.
2.what are the possible problems i might face
3.i came to malaysia on 30 may and still my taxes are being deducted from my salary.will this affect my new salary if i changed the visa to new company in december.

I could not find the ansers on the web.may be i searched wrong way. If someone can help it will greatly appriciated.

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