In Macrobond, a chart can only display series with the same amount of observations per year. When adding several time series with different frequencies, if no settings are changed, the document will harmonize the frequency of each series to the highest available one. Time series with a lower frequency will be converted to the higher frequency.
In Series list, you may change the frequency of the document by using the drop-down menu for frequency. To adjust the frequency conversion settings, go to series list and click on the Conversion Settings tab.
A typical case is to keep the highest frequency available, and convert the series with lower frequency using Linear Interpolation. Visually, these series will look like they are displayed in their original frequency.
For more information:
How can I mimic frequency conversions using formula language?