Auto-populate fields from one table into another

I've created a project table to record ongoing projects.  Separately, I have a tasks table that lists activities that are associated to ongoing projects.

I created a relationship between the two tables without a problem; however, what I would like to do is have a set of pre-determined tasks automatically populate into the project table based on a drop-down field selection within the project table.  Example: In my project table, if I select the event type as "webinar", I'd like all the assignments from the task table that relate to a webinar to automatically appear in the projects table.  Can this be done?

Thanks everyone!

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Gwen Peters
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