DND5E Weapon +1/+2 against x

Hi, Folks! I was told that my character has a Longsword+1 (+2 vs casters).  Is there a way to represent this on the character sheet? Thank you, Jen

he simplest way to do this is by setting up a regular Longsword +1 (drag from the compendium onto your character sheet), and then write something like this in the description: Attacking a spellcaster changes the longsword into a +2 weapon. Add +1 to hit and damage roll.

If you are happy to answer a query on every attack you could add the following to the description instead: }} {{r1=[[@{d20}cs>@{atkcritrange} + @{atkattr_base} + 0@{atkmod} + [[@{atkprofflag}]][PROF] + [[ 1 + ?{vs Caster|No,0|Yes,1}]][MAGIC]]]}} @{rtype}cs>@{atkcritrange} + @{atkattr_base} + 0@{atkmod} + [[@{atkprofflag}]][PROF] + [[ 1 + ?{vs Caster}]][MAGIC]]]}} {{dmg1=[[@{dmgbase}+[[@{dmgattr}]] +0@{dmgmod}[MOD] + [[ 1 + ?{vs Caster}]][MAGIC]]] edit: added the damage modifier for 'vs caster'

The simplest and fastest options when playing: Have a second attack for when you attack spellcasters. Your DM will need to tell you if the target is a spellcaster when you declare your attack. Just add 1 to the attack and damage rolls of the +1 attack. These are basically the same thing you would do at a table in person, just #1 does the math for you. It's faster to choose the correct attack action than answer a macro each time.