When there is a one OSD for all type’s of computers in the network and you want specific software deployed only on laptops, here is the howto 
What’s the differences between a laptop and a desktop? Correct, the battery. So the simplest way to achieve our goal is to check if there is a battery present in the system.
Open the OSD Task Sequence and add the required step.
During an OSD task sequence, I want the option to select if certain software is installed. This can be done by third party software solutions (like OSD++) but with ‘variables’ it’s possible direct in SCCM.
In this example I’m using the Windows XP Task Sequence which is advertised to the All Unknown Computers Collection and I want to choose to install AutoCAD 2010.
Right click on the collection and choose: Modify Collection Settings.
Go to tab: Collection Variables click on the new variable icon. Give the variable a name like: Install_AutoCAD_2010 and leave the value empty.
Edit the Task Sequence and go to the step where AutoCAD 2010 is being installed. Open tab: Options. Add a condition like the screenshot below.
When running the Task Sequence you are presented a screen where you set the variable. Set it to 1 to install AutoCAD.
Q: Howto filter software during OSD Task Sequence?
A: Create a variable to the collection and add it as a condition in the Task Sequence.
When creating a task sequence to deploy an operating system. It’s possible to ask for a computername when running the task sequence on a unknown computer, for instance a new computer.
Advertise (‘NO’ mandatory assignment) the task sequence to the collection: All Unknown Computers. 
Click on thumbnails for larger image.
Right click on the collection: All Unknown Computers and select: Modify Collection Settings.
Go to tab: Collection Variables click on the new variable icon. Give the variable the name: OSDcomputerName and leave the value empty.
When booting the task sequence, on a new computer (or remove the computer first in sccm) the following screens will appear:
When the following screen appears, double click on the variable and give the right computername for the new computer.
The task sequence will install the new computer with the new given computername.