Definition: { &hf_mongo_msg_sections_section, { "Section", *"mongo.msg.sections.section",* *FT_NONE,* BASE_NONE, NULL, 0x0, NULL, HFILL } }, Add to tree: ti = proto_tree_add_item( tree, *hf_mongo_msg_sections_section,* tvb, offset, 1 + section_len, ENC_NA ); *section_tree* = proto_item_add_subtree(ti, ett_mongo_section);