Excel provide you with several customization options for your column or cells:
For example: if you have a particular column dealing with currencies or percentages, you can customize it with the Cell Style options and upon entering your data, the currency/percentage symbols will be automatically entered.
Consider that in your worksheet you have a specific column for wages:
Simply select(click/hold/drag) the concerned data cell and then in the Styles tab, click on the Cell Styles Button.
Then Click on the Currency button.
From now on each time you enter data in this column the currency symbol will be automatically be entered.