Hi Bob,
When you attach a delivery template to a recurring delivery and save it, a new delivery template is created with same name but different internal name (obviously). You can try to mass update the delivery templates that are created after attaching them to a recurring delivery. This can be done by selecting the templates to be updated (In your case select the delivery templates created by recurring delivery), right click on selected list > Actions > Mass update of selected lines (check screenshot below).

When you select this option a console will open that will display a list of columns. These columns are related to various properties of the template. You can play around and find the concerning columns that correspond to the fields that you are willing to update/change (Find screenshot below). Once you select a column, you can insert the value that you want to update in the value field.

Continue with the steps accordingly and all the selected templates will be updated with the required values. Although there are some fields that might not be available in this list, but most of them can be found here.
Regards,
Jayesh