when you add plastic pellets to a plushie to help it sit upright, how are they kept in place? like, do you sew them into a little beanbag first, and then just leave that floating amidst the polyfill in approximately the right spot? or do you make a little internal pocket on the butt part of the plushie, fill that with pellets, and sew it shut? (asking because i'm pretty sure my current project won't be able to sit up unless i add weights)
i probably should do the "make a little beanbag" method instead of what i'm doing since that's more secure in case a plushie ever gets opened up for whatever reason, but i do something kind of akin to the second thing you said.
i usually approach every body part of a plushie separately unless there's a real need to have it all connected into one central cavity (and i have not found a good reason to do that yet, but i understand its a pretty standard practice for other plushie makers) so i fill every body part separately and that allows me to control what parts are stuffed with what, like legs and body should be weighted, arms and head probably not.
but basically i fill up the body part top-down with how much should go in there, and then "plug it up" with a layer of stuffing that goes on top and then fills out the rest of the body. that way the beads are secure in the bottom most position (or whatever position they need to be) and then i just add whatever part would cover that open gap area or sew up the body part completely and then attach it later to the other parts. i use just a standard fiber polyfill and its usually dense enough to keep the weight in the locations i want it too.
ovbs i can't speak to the nature of your project, im not very good about visualizing things without a specific context, but gravity is your friend even if it's also the hardest thing about using weighted stuffing pellets. leaving gaps to put in stuffing closer to the "top" of your plushie/plushie parts and then just pouring the pellets in from that point and then putting stuffing on top of it to give it structure is probably the easiest approach.