Hi Daniel Plomp,
It is possible to link entities from different modules.
You can create a metafield for your items which will hold links to related items. For example it will store the IDs of those items separated by commas. Then in the edit controls of your modules you can use the API of your module to get the related items in a list. And probably use some control such as RadListBox which is populated from the API and shows all available items you can associate to. Then you should edit the save method of your back-end controls to get the selected values from the RadListBox and put them in the metafield.
All the best,
the Telerik team
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