For partners, you can select which partner is current and which is/are ex-partners. This is shown by a thicker line on the tree.
If a person has had more than two partners and you want to put them (the partners) in order, (because a thicker line to the current partner will not distinguish between the exes) you can use the number trick in the wedding & divorce/relationship start & separation dates to do this. Note that this may not re-order them on the tree.
Please also see my answer to your other question.
Hope this helps!