float topBorder = Screen.height - topMargin;
float totalHeight = 0f;
int totalOk = 0;

for (int j = 0; j < subtipColumns.Count - 1; j++)
{
    int moved = 0;
    int step = 0;
    totalHeight = 0f;

    while (step < subtipColumns[j].childCount)
    {
        totalHeight += heights[step + moved + totalOk] + margin;
        if (totalHeight > topBorder)
        {
            RectTransform rect = (RectTransform)subtipColumns[j].GetChild(step);
            rect.SetParent(subtipColumns[j + 1], false);
            moved++;
        }
        else
        {
            step++;
        }
    }

    totalOk += step;
}