To add an item on a particular line in an Imprest list, go to:
Inventory
3. Imprest Stock
1. Imprest List Maintenance / Print

1. Site Code - Enter the site code
2. List Ref - Enter the reference
Option line - Enter 4
A menu will appear with the options that are available
Scroll down to Insert <+>

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and hit ENTER
A message "Insert prior to line:" will appear:

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Enter the line number that is below the required position. A line will appear above this line number:

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Enter the item and file the screen.