Journal Batches in Navision is usually used to seperate entries by different users. For example, Ken and Susan are woking on General Journal at the same time. To prevent Susan's journal entries are overwritten by Ken, 2 Journal batches can be created. 1 batch assigned to Ken and another batch assigned to Susan.
There are 2 ways to create Journal batch in Navision:
At the journal window, click on the Batch Name assist button to bring up the batches listing. You can add new journal batches from here
At Journal Template window, click on TEMPLATE --> BATCHES.