So, when an entire department goes PTM (like toys) - I used to drop batches using the PTM label printed on the red/white label paper.
I would put the PTM label in the label strip on the basedeck of the aisle - closest to the racetrack. The red/white PTM label is a visual indicator that the aisle is PTM.
I then start flexing out the Dcode into the aisle.
So, for toys, for example, I keep the types of toys together (My Little Pony, Barbie, Lego, etc.) I don't just shove toys into any aisle. If you drop in PTM batches by aisle, then pull your own, I'd suggest keeping the batches separate so that they are easier to work out.
I might take a toy that has multiple facings, and move it down to 1 or 2 facings so that I have room to put the discontinued product in the aisle.
I print Generic Flex Labels on a hip printer, and use them on the shelves and pegs, as needed.
I try not to cover up any Active items, because that just makes it confusing for Flow - or whomever is trying to stock the item. I will condense active, but not completely cover the space.
I will also add pegs when there is room. I might adjust the spacing on the current pegs, so that I can squeeze in another row. (like in Hosiery, or Toys, or Sporting Goods swim googles.)
I also use a Zebra or other device to flex over Out Of Stock Discontinued items. Those are unlikely to be sent to your store from the DC, and the space for those products can be filled with D-code from the BR.
I'd also let the TL of the area know when the department becomes PTM.
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I'd guess right now you'd want to focus on Sporting Goods Swim aisles, and any Summer Toys (hula hoops, bubbles, water guns, etc.) Those should be going clearance soon.