You want to order the item list with your own ranking.
1) You need define a UDF in SAP B1, go to menu bar: Tools -> Customization Tools -> User-Defined Fields Management -> Master Data -> Items -> Add
UDF tile: COR_CLOUD_ORDINAL
Description: Sort item
2) Fill in UDF value on Item Master Data (your sorting preference) -> update Item Master Data
3) Once above steps are finished please wait for a minute. Then synchronize the iPad/iPhone again. The items with an ordinal number will show on top of the list and ordered ascending by the ordinals value.