Nope...no love for self-coached athletes. Must do the hard way. Sucks...its been asked for several times on uservoice. I even asked for it once ages ago, back what it was trainingbible.com.

Only way is to get a coaches subscription, and "coach" yourself---which includes 1 premium account. That's a $99 fee + $19 per month---basically triple the single user price.

Other option is to simply copy weeks. Not optimal but doable.

Not ideal, but you could create the plan in year 2019 today, and then shift the entire plan to a new start date. I just tried with a couple weeks and it is pretty easy. Basically, you select the dates of the weeks you want to shift and then can select a new start date and it will move everything. For example, you could create a plan with the first date being Jan 15th 2019, enter all the workouts from Jan 15th 2019 to September 20th 2019. Then go to the first week, hit "Shift". Under the Shift options, you can choose the dates you want to shift. In this example Jan 15th to Sept. 20th 2019 and choose a new start date, say July 1. It will more your entire "plan" to begin on July 1.

This is basically what I do. My weeks typically have the same structure, so I copy and then adjust the volume per workout as needed.