Hi @AliciaDG , Please correct me if I am wrong. Based on your explanation, you want to have your code dynamic enough so that whatever items are ordered, only that information should be available in body of email and any of the item which is not ordered then that information should not be available in the email body.
If this is what you are looking then use below code of each items:

If(!IsBlank(Datacardvalue80.Text), "<b> Prayer Request Cards quantity: </b>" & " " & Datacardvalue80.Text & " " & "packs of 250 units" & "<br/>");
If this is not what you are looking then please elaborate your requirement.
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I hope this helps.
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Thanks,
ANB