We can use a tab-delimited text file to add sample attributes. The text file should have samples on rows and attributes on columns with the first column containing the sample IDs. 

• Select the Data tab
• Select Assign sample attributes from a file (Figure 1)
  
  

Figure 1. Adding sample attributes from a file

• Select the file Sample_attributes.txt from the same folder as the fastq files (Figure 2)
  
  

Figure 2. Select .txt file with sample attributes

• Select Next
• Select the Import checkbox for Treatment (Figure 3)
  
  

Figure 3. Selecting the Treatment attribute for import

• Select Import
  

The treatment attribute will be added as a column next to the sample name (Figure 4)

Figure 4. Sample attributes appear as a new column in the data table

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