help, I need to tone down some chipotle/pineapple sauce, I think it is way too hot for my guests

Sweet generally helps with heat so maybe you could add more pineapple? Or a teaspoon or 2 of sugar.

here's this cute graphic from a uk newspaper to help:
http://www.dailymail.co.uk/femail/food/article-3109175/How-make-hot-food-taste-spicy.html

Since we don't know what's in it, it is hard to guess what will work. First, I suggest you make another batch without the chipotle, then combine the 2 and adjust taste. Or just start adding in all the other ingredients and adjust taste. If it goes, you can turn it into a sour cream dip/sauce as the fat will coat your tongue and sooth it. Bottom line it that there is no magic way to just remove hot peppers.