keep the frequency argument when importing data

[gyw1028]

Dear all,
I want to create a workfile with frequency argument, and import excel data.
When I create a workfile by using the following code:
wfcreate test d5 2013-7-1 2014-8-31
I can obtain a workfile with frequency argument, just like picture one:

one.png (2.41 KiB) Viewed 1934 times

When I import excel data by using the following code:
wfopen d:\dpr.xls range="Sheet1!B2:C428" names=(purchase,redeem)
The frequency argument is disappeared, just like picture two:

two.png (1.71 KiB) Viewed 1934 times

How can I keep the frequency argument when I import excel data?
Thanks!

[EViews Gareth]

EViews obtains the frequency information from the Excel file. If there is no frequency information in the Excel file, EViews won't be able to find it, so you'll need to use the pagestruct command to impose it.

[gyw1028]

EViews obtains the frequency information from the Excel file. If there is no frequency information in the Excel file, EViews won't be able to find it, so you'll need to use the pagestruct command to impose it.

Thank you very much :D