Hi, I'm currently basing the Foundation and is it possible to add custom field for Line Items form? For example, adding "custom field" next to shipment status.
Lineitem, as well as other order components, are not business foundation objects, and can't be extended/managed by such. You need to have access to Commerce Manager Administration for this
Shameless plug, this is discussed in details in my book https://leanpub.com/epicommercerecipes