Hi kizj,
You can read about COL's margin facility here:
https://www.citiseconline.com/Final2.../HOME_Faqs.asp
Requirements are all there. I applied by sending my documents via courier and i got approval after about 2 trading days. Actually, when you already have a margin account, by default, all your purchases will be made using your actual cash on hand. But in case you want to buy over and above your actual cash on hand, you can do so. So long as it is within your margin limits, pwede ra. No approvals needed. Ikaw bahala. Your cash balance then becomes negative. The negative amount is the amount you are trading on margin and that accrues interest every day computed based on the formula epgarias showed in this thread. thanks bro.
Then when you liquidate, like I just did today, the cash balance is adjusted automatically. In my case, nibalik siya ug positive.
Basta be careful lang jud with margin bro. Be sure you have a solid trading system and stick to it. To be fair, COL warns people as much in their website. But if you ask me, I am liking it very much. I have so much more flexibility. If your money management is meticulous and comprehensive, you shouldn't have a problem and might find the facility God-sent.
Magpadato na ta!!!!