Hi Divya,
There is no option to dynamically change the height of a field in CR. You can set the width dynamically from the 'size and position' option, however not the height.
Here's a workaround if you would like to try:
1) Make sure both the fields have same width. The safest thing to do would be to right-click the reference field (The brand field) > Select size and position > Note down the 'width' and use the same value for the date field.
2) We would NOT be using the database fields directly on the report, instead we would create separate formulas for each of the fields and drag these formulas on the Report Header section. Here's a sample formula for one of the fields:
stringvar d := totext({date_field},"yyyy/MM/dd");
d & "<font color = white>" & left({Brand_field},len({Brand_field})-len(d))
3) Drag this formula on the Report Header section Right-click > Format Field > Paragraph tab > Set 'Text Interpretation' to 'HTML Text'. Also make sure 'Can Grow' is turned ON.
P.S: Use a fixed width font like Lucida Console for better results with this code.
Let me know how this goes!
-Abhilash