Link Project Template to DFF in oracle fusion PPM

Summary:

There are 2 BUs and each of these 2 BUs require different set of DFF attributes while creating a project.  Hence there were 2 separate context segments created each having the attributes specific to the BU. The user creating the Project for that BU will select a specific BU template, so that respective set of DFF attributes only get added to that BU specific project. How to link this BU specific template to the respective context specific segment in Manage descriptive Flexfield ? Please suggest. Thanks in advance

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