How to make array of struct and return from a function in golang?

Use append to collect the results in a slice.

func procData(values []string) ([]Process, error) {
    var result []Process
    for _, value := range values {
        var process Process
        pieces := strings.Split(value, "-")
        if len(pieces) > 1 {
            process = Process{pieces[0], pieces[1]}
        } else if len(pieces) > 2 {
            process = Process{pieces[0], pieces[2]}
        }
        result = append(result, process)
    }
    return result
}