Bid Type "Alternate"

Hi! Has anyone used the Bid Type "3-Alternate" in the Estimating Module and how is it used? I will explain what we are wanting to do and how we would like for it to show up. 

We have always used Bid Type 1-Base Bid. Occasionally a client will ask for an alternate price (ie. install wood floor instead of carpet). We have always just added a note for this. Sometimes they pick this up, sometimes they don't. If they do pick it up, I've always just written a change order for it. 

I played around with adding a Bid Item as an "Alternate" Bid Type, but the price is just added to the rest of the take off. There is no differentiation between what is a Base Bid and what is an Alternate. Same goes for when it is exported to a Proposal. 

It would be nice to see all the Bid Items that are part of the Base Bid, with the total, which will be the Proposal price. Plus lines beneath that for all Alternates. If they aren't separated, how will the client know the difference?

Any input would be greatly appreciated. Just trying to make it easier for both us and our clients. 

Thanks!