Final answer:
To delete everything after a character in Excel, use the LEFT function and the FIND function with an example provided.
Step-by-step explanation:
To delete everything after a character in Excel, you can use the LEFT function and the FIND function. For example, if you have a cell containing the text 'Hello, World!' and you want to delete everything after the comma, you can use the formula =LEFT(A1, FIND(',',A1)-1). This formula will return 'Hello' as the result.