What kind of rules do you have for opening additional positions once in profit?

I've noticed this an area of difficulty with me. I find that I have a difficult time managing the positions if the second one happens to go negatively.

While just not opening new positions or, at least further away, would seem like the logical answer, I'm looking for something a bit more methodical.

What kinds of strategy do you employ in these situations? Smaller position sizes for the additional positions? Do you use a set amount you have to be in profit before you add, or discretion?

i also need help on this, although i do believe in adding smaller positions than you started since you don't want to really wipe out the gains you made with the added positions

Hi,

You would find that you are more willing to add to losing position that winning position. You probably add more and lose exponential faster. Ironic that negative goes faster that positive.
Not sure how you trade. But remind you that overall winning can turn overall lost pretty fast. Make your price spacing bigger for another trade.
For adding position strategy, you should focus on at what price to add. Relevant to time.

Regards
Yy