It is not possible to create different chart types within one chart.
<cfchart …>
<cfchartseries type=“bar” …> …
<cfchartseries type=“bar” …> …
<cfchartseries type=“line” …> …
will create three series with bar as charttype, and
<cfchart …>
<cfchartseries type=“line” …> …
<cfchartseries type=“bar” …> …
<cfchartseries type=“bar” …> …
will create three series with line as charttype.
It is not possible to mix different chart types.