If you want to create an Index with Included columns just create the index, add the field and set the "Included column" property to YES
Category: Indexes
SQL SERVER – Clustered and Nonclustered Indexes Described
An index is an on-disk structure associated with a table or view that speeds retrieval of rows from the table or view. An index contains keys built from one or more columns in the table or view. These keys are stored in a structure (B-tree) that enables SQL Server to find the row or rows … Continue reading SQL SERVER – Clustered and Nonclustered Indexes Described
AX / Dynamics 365 For Finance and Operations blog 