There are two steps involved in adding BLAST database locations to a CLC Server.

1) Add the location as an Import/Export location.

2) Add it as a BLAST database location.

These actions are done using the web administrative interface of the Genomics Server and are described in more detail in the manual here:

https://resources.qiagenbioinformatics.com/manuals/clcgenomicsserver/current/admin/index.php?manual=BLAST_databases.html
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This information is relevant for other CLC Server products that offer BLAST searching.