Am I interpreting correctly, to feed and move outside for a few weeks, then prune both branches? First, flush the soil by pouring a volume of room temp water equal to at least 10X the volume of the pot it's in. This will reset fertility to as close to 0 as you can get. Wait an hour or so, and fertilize with a production strength dose of the Foliage-Pro 9-3-6.
The pruning cuts should be such that you shorten the 2 long branches enough that you only leave 2 (healthy looking) leaves on each side of the Y. I know it's hard to remove growth you're nurtured and coaxed into existence, but you have a perfect opportunity to take control over the plant's growth habits. If you keep pinching as I described, I promise you'll thank me for allowing me to talk you into it. I counted my Ficus this spring as I brought them up from the basement, and I have 45 (Ficus) trees covering 11 species, all growing in different stages of development as bonsai, some older than 30 years, so I'm very familiar with how these trees respond to cultural conditions whether good or bad.
Prune above or below the axis point? The point of bifurcation is where the single stem turns into a Y/ slingshot. You'll be pruning immediately distal to (above) that point. When would I move it back indoors? It'll show its appreciation if you leave it out all summer.
Al
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planter boxes along right side yard
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