One only can have one CDS per investment house or broker house. But one can have mutiple CDS account with different broker house.

For non-nominee account,

If one bought xx share in OSK, then it wil be credited into your CDS that open in OSK.
But if one bought yy share in CIMB, then it will be credited into your CDS that open with CIMB.

Those CDS accounts are not cross-linked and remain as individual one. Aka even you have xx share in OSK CDS account, you can't sell through CIMB even though you have the share. Unless one transfer it to the OSK CDS, otherwise one needs to sell through CIMB.

But one can have 2 trading account with OSK, but only 1 CDS account can be opened with OSK, you can't have 2 CDS account with the same investment house and it will be shared among the 2 trading account.

Hope this clear up a bit.

Welcome, I knew because I have multipe CDS with different broker house.

You need to check with OSK whether the IPO shares had been credited into your CDS already or not.
or
Check with OSK regarding the online trading restriction/problem if the shares already being credited into your CDS.

Skid,

Your calculation make him confuse.

Net sales amount = 6600 - brokerage fee = 6600 - 36.99 = 6563.01

Net buy amount = 6379.91

So net profit = 183.1

Still the same. Just he might be confuse the way you compute. Make it straight forward, then he can see more clearly and easily.
You method still right, just the way of the calculation, he might not see it.