"Bid Alternates or Multiple Units?"
Merge or Combine Bids
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BID MERGE - Create a base bid and merge another bid with it.  
BID MERGE - Great for those who have to do alternates for customers, each alternate is a separate bid once you know which alternates the customer wants simply merge them into the main bid. This feature is great for those who deal with typical units like plan A, B, and C. Lets say you have a building with 4 plan A units, 3 plan B units and 5 plan C units. You would estimate the core building then estimate each plan as a separate bid. When you merge each plan enter the number of unit of that type.