How to reference another sheet in Google Sheets
You can watch a video tutorial here.
When working with a file with multiple sheets, you may need to refer to data from another sheet or link data in multiple sheets. Using the sheet name and the cell reference, you can either pull data from another sheet or link two sheets so that changes in one are reflected in the other.
Step 1 – Create the formula

– Select the destination cell and type an equal sign (=)
– Go to the source sheet and select the source cell
Step 2 – Copy the formula

– Using the fill handle from the first cell, drag the formula to the remaining cells
OR
a) Select the cell with the formula and press Ctrl+C or choose Copy from the context menu (right-click)
b) Select the rest of the cells in the column and press Ctrl+V or choose Paste from the context menu (right-click)