Hi Barcodelabel,
To use the functions that Wayne mentions you need to set up a relationship between the two tables so that the Invoice table can look up information in your Master table.
Here is a simple example where I use an InvoiceID on each row of the Master table and include that InvoiceID in cell A1 of the Invoice table.
This screenshot shows how you can use the INDEX MATCH combination to look up the Customer for InvoiceID 100:
=INDEX(Master::B,MATCH($A$1,Master::$A,0))
The CustDetails in the cell below it are looked up with this formula:
=INDEX(Master::C,MATCH($A$1,Master::$A,0))
It's the same formula except the lookup has been changed from column B to column C.
You can also get a little fancier:
The Description is looked up with this formula:
=INDEX(Master::$A:$F,MATCH($A$1,Master::$A,0),MATCH(B$4,Master::$1:$1,0))
It's a more complicated formula, but it has an advantage. You can just fill right to the Quantity and Price columns and it will adjust automatically to look up the relevant information from the Master table based on the label you put in the row above it. It's doesn't matter, for example, if you decide to switch the order of the Price and Quantity from what it is in the Master table.
When you change the InvoiceID in cell A1, the Invoice table will now pull the relevant information from the Master table.
SG