I have found in a website how to do a portfolio.
SELLING YOURSELF:
When applying for a job, you need an effective Curriculum Vitae (CV) and covering letter. To be effective, your CV and covering letter should be customised to each job. Further, the document should clearly demonstrate how you meet the job's selection criteria.
A helpful method of drafting effective CVs and covering letters is to develop an ongoing system of resources for yourself by building a portfolio.
WHAT IS A PORTFOLIO?
A portfolio is a way of documenting all aspects of your professional and personal growth as you progress through university and your career.
A portfolio isn't the same as a CV— a CV is only a summary of your education, employment history and achievements, whereas your portfolio allows you to expand on these experiences and provide evidence of your achievements. Your portfolio complements your CV.
Your portfolio can include:
• descriptions of your activities and achievements (for example, descriptions of the research project you did last summer and the award you won in the state debating competition)
• your birth certificate
• transcripts of your academic records (from uni and high school)
• written references from employers or colleagues (for example, from your employer when you worked for five years at a fast-food restaurant)
• official letters certificates (for example, a First Aid certificate)
• publications (for example, a scientist might keep a copy of her published journal papers)
• examples of your work (for example, a writer might keep samples of good writing, a photographer might put in a series of favourite photographs, ...)
You can get more information at: http://www.lifelongearning.science.usyd ... obapp.html