You basically transfer more funds to your margin trading account, so that you have a bit more "margin" % before you are liquidated. That's atleast how it worked on poloniex.
This is not exactly what I was asking, I wanted to know how to (or even is it possible?) keep one and unique long (or short) margin position and "increase" it over time, without having to open a new one every time i want to keep on longing (or shorting) the same crypto.
I have the funds to back it up, it's just not practical to have 4 or 5 margin positions open at the same time instead of one. If I want to close 25% of my position, to take gradually take profit for example, i can't really. I have to close my FIRST margin position I made before the other ones. At least that's how it works for Kraken. Or if I want to gradually margin trade (shorting) on a downward trend to avoid taking too much risk, it's impossible without having to open a lot of margin trades, and it ends up being a mess visually. So it's really not convenient.
Is it the same thing on all the other exchanges ? Can i fix that on kraken ?
Thank you a lot for the reddit post, that's exactly what I was looking for.