Calculate Due Date Based On Fields From Another Table

I have a form for entering safety training which includes Training Date and Expiration Date, this form is called "Scheduled Training".

The table containing training courses with their requirements and frequency is called "Course Requirements". Within this table I have a "Frequency" field (1, 2, 3, 4, 5, 6) and another field "FrequencyPeriod" (Year, Month, Initial, As Needed).

What I'd like for the Expiration Date on the form to do: Use [ScheduledTraining].[Training Date] and look at both the [CourseRequirements].[Frequency] & [CourseRequirements].[FrequencyPeriod] to populate the Expiration Date.