No. Wishpicks doesn't have a way to split the cost of one gift between several people. There's no group gifting, chip-in, or money-pooling feature, and Wishpicks never handles gift money at all.
A reservation is a plain "one person, one item" marker. It has no amount or share to divide.
What you can do instead
Have one person reserve and buy the gift — reserving marks the item as taken so no one else buys it too. See "Do I have to reserve a gift before I buy it?" Then sort out the money among yourselves, off Wishpicks: decide together who pays the store and how you'll settle up. Wishpicks isn't involved in the payment. See "Does Wishpicks process payments?"
Common mix-ups
"Contributor" is about editing, not money. On a shared wishlist, a Contributor is someone who can add and edit wishes — it's a co-editing role, not a financial contribution. See the Shared Wishlists & Collaboration collection.
Wishpicks never processes gift money. You buy at the external store, not on Wishpicks, so there's nothing for it to split. See "Can I buy a gift directly on Wishpicks?"
Reserving costs nothing. It doesn't charge anyone or place an order — it only marks the item as taken.