1.  All POS sales start with an "item". 

2.  Many "Items" then roll up to a  POS "Order" -  (Please note a POS 'order' is not the same as a regular "Order", so don't be confused, we will return to this concept shortly.)

3.  Many POS "Orders" can then roll up to a 'Bill'  -   (Please note a Bill is sometimes call an 'Invoice') 

4. Many Bills can roll up to Orders (a regular 'order') 

To illustrate take a look at this example.  

Jane purchased the swim team item and did not purchase anything on POS Order 428. 

Later that day she bought a shirt & a pizza for the kids, POS Order 429. 

Then the Pools Admin consolidated the orders onto 1 bill, Bill #60  which is for $155.

These 2 'orders' roll up to a 'bill' #60 (the system also calls it an" Invoice" in some places, mainly on the members payment screen so be careful with these terms) 

Now when Jane goes to pay for her 1 'Bill', with 2 orders and 3 items & this is what she sees. 

WOW! looks like Jane forgot to pay her mandatory Capital Improvement fee, so she has to do that as well. 

This all rolls up to a regular Order #432 for $230 which she now pays.

Once she pays this "Order" these transactions appear in the regular transactions reports, however they are split back apart and contain the "order" numbers from the earlier pre-consolidation.