In more complex worksheets, you may want to create formulas that refer to data on another worksheet. 3-D formulas allow us to do this, fairly easily.
The syntax for the formula is worksheet_name!reference.
"Worksheet_name" refers to the name of the worksheet that provides the information. "Reference" is the name of the cell or range that holds the information we want to use. "!" is the divider between the two parts.
How To Create a 3-D formula: