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)
  
  

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

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

• Select Import
  

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