Instead of using the built-in Excel options for currency, I'd like to create a custom symbol for a currency. For some currencies, Excel uses the actual symbol itself, such as $, , ¥, et cetera. For others, it uses the three-digit currency code, which is not a symbol itself. For example, BOB is the currency code for Bolivian bolivianos, so Excel would display it as 100 BOB if I chose the bolivianos option. In this example, I'd like to create a custom prefix that adds "Bs." to the beginning of the number in the cell, while still treating it like a number, so I can use formulas to add multiple cells and total my spending, as well as convert said total into USD. I can't seem to figure out how, as my best guess in Format --> Format Cells --> Number --> Custom gives me an error, which I'm attaching as a screenshot. Thanks for any help!