In SP10 and later this was not possible, but it's hard for me to find if Microsoft has made it possible in SP13. I have created a lookup column and wanted to be able to select multiple choices from the options. An easier solution would be to create a choice column and select checkboxes. But I do not want others to go into the library settings to change the column choices. Think it's easier to update from a list for others that have minimal SP experience to update.
Does anyone know if adding a lookup column with multiple selections is possible in SP13? If so, how can I go about having this?