How to project WMS layers from GCS_WGS_1984 to UTM ED50 31N using ArcMap?

[MarcMarí-Dell_Olmo]

I'm using a WMS service to open different layers. Specifically I'm using this link:

http://w24.bcn.cat/WMSBaseGuia/request.aspx

I have the following problem. When I open these layers with Arcmap, its projection is:

Geographic Coordinate System:GCS_WGS_1984 Datum: D_WGS_1984 Prime Meridian: Greenwich Angular Unit: Degree

However I would like to transform it (or project) to Europe UTM ED50 31N (units meters).

Anyone can help me to obtain this projection with ArcMap?

Thank you!

[MelitaKennedy]

I think you asked this elsewhere, but can't remember where!

In some ArcGIS versions, you may not be able to reproject WMS layers, but if you can, open the data frame properties (right-click Layers in the table of contents or right-click in the map) and select the Coordinate System tab.

In the directory view, select Projected Coordinate Systems, UTM, Europe, and then look for ED 1950 UTM Zone 31N. Click it and OK all dialogs.