Hi Aamir,
You can do it by using Typo Html Plugin:
If you would like to put a constant unit like you just want to use Kg as Prefix of your field use this code in Html (<b>*value* Kg</b>) without brackets.
Or if you would like to use different units in the same field you should add two fields:
1. First_Field : This field will be for Quantity (i.e 1000)
2. Second_Field: This field will be for Unit (i.e Kg), you can use Select Simple Field or Text Field to put unit manually.
In Content Tab press button 3 and select Typography as Html and add this code in Html (
<b>$cck->getValue('first_field'); $cck->getValue('second_field');</b>
)
Hope the above is the solution for you.
Please study Plugin Typo Html Documents.
Regards,
Umair Hassan Raja