Quicker is advanced WooComerce quick check out plugin that to add custom fields along with multi-step checkout, and set upsell and quick sell options at ease.

Checkout Fields Manage(Checkout, My Account, Register) � Best WooCommerce checkout manager plugin to quickly add or edit a field on WooCommerce checkout.

Checkout Field Editor (Checkout Manager) for WooCommerce – The best WooCommerce checkout manager plugin to manage WooCommerce checkout fields.