Try using a Numeric Source block to read in the units for the Seize block. In the Numeric Source block, select the option Data Driven, and then from the Type pull-down menu, select SAS Data Column. You will need to specify the file path for the data set, as well as the column name that contains the values that you want to read in (the Variable field). The SAS Data Column option can also be used to read in a column of data from a JMP table.
The second part of your question is a little unclear, but it sounds like maybe you are trying to seize a specific entity type using a Seize block. If this is the case, there is a small down arrow next to the Separable field in the Seize block properties dialog. If you click on that arrow, you can select to add columns for Attribute Rule and Entity Type. To specify an Entity Type, you can just put in the name of the entity type that you want to seize (rules using || or && or Cond are not allowed in the entity type field). For example, if I want to seize an entity of type Doctor, I just type Doctor in the Entity Type field of the Seize block.
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