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When you transfer cases that belong to mobile user "Lalita" to mobile user "Sheela", the transferred cases will be reflected on Sheela's case list on her phone once her phone syncs to CommCareHQ. On the server side, form submissions made by Lalita will always be linked to username Lalita because she completed those forms. The change will however be reflected in the case exports, which will show Sheela as the new owner of the case. Any new form submissions completed by Sheela for the transferred case will reflect Sheela as the username in the forms exports. The old submissions for that case will still remain under the username "Lalita".