So, this may be a dumb question... but how do you remove your arms and legs so that you can have different posed arms and legs. For example:

Not a dumb question at all! There are two ways:

1. In the 'Base' tab of the wardrobe, you can toggle the different limbs on the lefthand side to hide them https://new.subeta.net/wardrobe/base

2. In the Millionaire Center we have different Whiteout Pens that you can buy and wear on your avatar to hide limbs https://subeta.net/ss.php/millionaire#/shop/All_Year

Oh gosh! How did I not see that in the base layer section of the wardrobe?! Thank-you so much for pointing all those out to me!

No problem! Glad I could help :D