Importing data into custom Forms

I have created a custom form for inputting data to a project called Milestones. I added all the fields to collect the information needed to be entered. I want users to be able to import the information into this form, so they don't have to do it multiple times for the same information. Meaning they may have 15 milestones and I want them to use an Excel file to import them into this form. Is that possible?